Michigan’s primary could be Bernie Sanders’ last, best chance to challenge Hillary Clinton’s grip on the Democratic presidential race.

That’s what USA Today, in a preview of Tuesday’s contest, writes about the election in the key Midwestern industrial state. Michigan is the ideal audience for Sanders’ campaign message about “unfair” trade deals, income inequality and a “rigged economy.” Clinton, meanwhile, has consistently led in polls of Michigan voters. Most polls close in Michigan at 8 p.m. Eastern and all polls close at 9 p.m. Eastern.

Also read:Hillary Clinton, Donald Trump take strong leads in Michigan poll.

Hispanics against Trump: Donald Trump’s harsh language against Mexican immigrants hasn’t just helped him win a big delegate lead in the Republican presidential primaries — it’s also spurring Hispanic immigrants to seek U.S. citizenship so they can vote against him.

The New York Times writes that while naturalizations generally rise during an election year, Trump has provided an extra boost. The Times speaks with Mexican immigrants in Colorado and reports that overall naturalization applications increased by 11% in the 2015 fiscal year over the year before, and jumped 14% during the six months ending in January. Trump has vowed to deport undocumented immigrants and calls for building a border wall that he says will be paid by Mexico. A Trump spokeswoman told the Times that no one will benefit more from Trump’s immigration policy than “the millions of immigrants who already call America home.”

Make or break: Time is running out for those who want to stop Trump from winning the Republican nomination for president. As NBC News writes, if Trump isn’t stopped in the winner-take-all states of Ohio and Florida on March 15, he will likely become the GOP nominee. At the very least, NBC says, he would force an ugly contested convention. If Trump cleans up in Michigan’s primary on Tuesday, it could signal his populist message is catching on in the Rust Belt, setting him up well for neighboring Ohio.

Romney records message for Rubio: Mitt Romney, who last week ripped Trump in a forceful speech, has recorded get-out-the-vote calls for Trump’s Republican-primary rival Marco Rubio. The New York Times writes the calls will go to voters in the four states that vote Tuesday: Michigan, Mississippi, Idaho and Hawaii. The Times says Romney’s message is more about sowing doubts about Trump than it is about helping Rubio.

Supreme Court piñata: With President Barack Obama expected to soon nominate a replacement for the late Supreme Court Justice Antonin Scalia, the Senate’s No. 2 Republican is warning that potential nominees should consider the battle they will be forced to endure if picked for the post. “I think they will bear some resemblance to a piñata,” said Sen. John Cornyn of Texas, according to CNN.