The biggest day of this year's primary campaign is approaching as 15 states -- plus American Samoa -- vote in contests known as Super Tuesday.

The elections are a crucial moment for President Joe Biden and former President Donald Trump, who are the overwhelming front-runners for the Democratic and Republican presidential nominations. As the day with the most delegates up for stake, strong performances by Biden and Trump would move them much closer to becoming their party's standard bearers again, setting up a likely rematch between the two in November.

The contest will unfold from Alaska and California to Virginia and Vermont. And while most of the attention will be on the presidential contest, there are other important elections on Tuesday.

Here are some things to watch:

Does Trump Keep Rolling?
So far, the Republican presidential primary has been a snoozer. Trump has dominated the race and his last major rival in the race, former UN Ambassador Nikki Haley, is struggling to keep up. She lost the Feb. 27 primary in Michigan by more than 40 percentage points. She even lost her home state of South Carolina, where she was twice elected governor, by more than 20 percentage points.

As the race pivots to Super Tuesday, the vast map seems tailor-made for Trump to roll up an insurmountable lead on Haley. His team has been turning up the pressure on Haley to drop out, and another big win could be a major point in their favor.

Haley's banked a considerable amount of campaign money and says she wants to stay in the race until the Republican National Convention in July in case delegates there have second thoughts about formally nominating Trump amidst his legal woes. But she's seen some of her financial support waver recently -- the organization Americans For Prosperity, backed by the Koch brothers, announced it'd stop spending on her behalf after South Carolina.

She may not be able to afford another sweeping loss.

Do College Grads Keep Turning Against Trump?
Amid Trump's commanding wins, this primary season has been a notable warning sign for November -- he's performed poorly with college-educated primary voters.

In New Hampshire and South Carolina’s Republican primaries, APVoteCast found that college graduates picked Haley over Trump. Roughly two-thirds of voters in both states who went to graduate school after college voted for the former South Carolina governor.

In South Carolina, Trump won the suburbs but not by the same magnitude as his dominance in small towns and rural areas, essentially splitting the vote with Haley.

One of the biggest questions Tuesday night is whether Trump can start repairing that rupture. Weakness with college graduates and in the suburbs where they cluster is what doomed Trump in 2020.

Does Biden End Doubts?
As sleepy as the Republican presidential primary has been, the Democratic one has been even quieter. Incumbent President Joe Biden has many political problems dragging him down in public opinion polls, but not, so far, at primary polling stations.

The one-speed bump came in Michigan, where an organized attempt to vote “uncommitted” in the primary there to protest Biden's support of Israel during the war in Gaza garnered 13 percent of the vote, a slightly higher share than that option got in the last primary under a Democratic president.

There are no similar organized anti-Biden efforts on the Super Tuesday calendar, just the president's two longshot primary opponents who've yet to crack low single digits against him, Rep. Dean Phillips and self-help author Marianne Williamson, who revived her campaign after receiving a surprise 3 percent of the Michigan primary vote.

We should be alert for any sign of Biden weakness, but also for evidence that the president is in a stronger political position than might be assumed.

What Happens In California's Senate Race?
There's far more than the presidential primaries on the ballot Tuesday. One of the most consequential contests is the California primary for the US Senate seat left open by Democratic Sen. Dianne Feinstein's death.

The seat's temporary occupant, Laphonza Butler, isn't running for a full term, and California's distinctive “Top Two” primary may determine who replaces her even before November. Rather than having the winners of party primaries face off in November, California throws every candidate into a single primary and has the top two vote-getters make it to the general election.

Democrats have a lock on statewide races in the overwhelmingly blue state, and for months the speculation was that two prominent House members from that party, Reps. Katie Porter and Adam Schiff, would battle it out until Election Day. But that's changed since former Dodgers great Steve Garvey threw his hat in the ring.

Garvey, 75, is both a Republican and a novice at politics. Schiff has been airing ads slamming him -- or, more accurately, promoting him -- as most likely to carry out Trump's wishes. The idea is to unite the state's outnumbered conservatives behind Garvey so he and Schiff finish in the top two, denying Porter a spot in November. Schiff would then be the overwhelming favorite for the seat.

It's an electoral bank shot with a long tradition in politics. California's Top Two primary was passed by voters in 2010, partly to stop partisans from engaging in primary shenanigans. Among other things, the state's Senate primary will be a test of whether, in the end, motivated politicians can game any system.

Which Way on Criminal Justice?
Voters in two of California's most famed urban areas -- San Francisco and Los Angeles -- will get to again grapple with questions of criminal justice and public order.

In Los Angeles County, District Attorney George Gascon faces 11 challengers in a primary amidst scathing criticism of his progressive approach that includes not seeking cash bail for misdemeanors and nonviolent felonies and not prosecuting juveniles as adults. His opponents have blamed him for a rise in property crimes in some parts of the county, including a brazen smash-and-grab spree at luxury stores.

Still, Gascon's weathered criticism before, including two failed recall efforts, one of which was in his first 100 days of taking office. The primary will determine who he faces in November and whether there are signs that Los Angeles' liberal voters are changing their minds.

In San Francisco, Mayor London Breed is pushing one ballot measure to expand police powers to use tactics like drones and surveillance cameras, and another testing single adults on welfare for drugs. The two initiatives come as the city has been wracked by homelessness and drug use, and Breed faces a cranky electorate in her own reelection in November.

Another GOP Test in Texas
Texas' Attorney General, Ken Paxton, last year survived an impeachment led by his own party. Now he wants payback, and Trump is helping him. The primaries here will be a test of how Republican voters are willing to regulate their own leaders.

The impeachment stemmed from Paxton's legal woes. He faces an April trial on felony security fraud charges, and an additional federal corruption probe over the allegations that he used his office to favor a campaign donor that was the foundation of the impeachment charges.

As payback, Paxton is targeting more than 30 Republican state lawmakers in the party's primary Tuesday, including the very conservative House Speaker, Dale Phelan. Paxton is also trying to remove three Republican judges on the state's conservative appeals court who voted to limit the attorney general's powers.

Paxton has been a staunch supporter of Trump, including the former president's attempts to overturn his own 2020 election loss, and Trump is helping Paxton in his primary campaign. The Texas purge will be a test of what Republican voters value the most in their elected officials.

Can NC Candidates Unite Parties?
Most of the country picked its governors in the 2022 off-year elections, but North Carolina is gearing up for an intense race this fall. The major-party front-runners for the seat being vacated by term-limited Democratic Gov. Roy Cooper both will need to demonstrate an ability to unite their parties in the primary.

The Democratic front-runner is Attorney General Josh Stein, who has Cooper’s endorsement. His main competitor is former state Supreme Court Associate Justice Mike Morgan, who is Black. Watch whether Stein’s able to hold onto a significant share of the primary’s Black voters, which is essential for any Democrat who wants to be competitive in November.

The Republican front-runner is Lt. Gov. Mark Robinson, who is also Black. He’s been a divisive figure for some for criticizing vocally the teaching of LGBTQ+ issues during sex education and for comments at a church that Christians are “called to be led by men.” His GOP primary opponents -- State Treasurer Dale Folwell and trial attorney Bill Graham -- argue Robinson is too polarizing to win in November.

Robinson received Trump’s support last year, but it’s worth watching whether he shows the same weaknesses as the former president among college-educated, suburban voters. Biden’s reelection campaign is targeting North Carolina because it thinks those voters can help him beat Trump there.

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