WISCONSIN PRIMARY: 4 things to know

- After 10 days of intense campaigning, the polls are open for the Wisconsin primary. Here’s a look at what’s happening and what’s at stake:

REPUBLICANS: Wisconsin could be a particularly important state for Donald Trump. Political analysts say a loss in Wisconsin would make it harder for Trump to win the 1,237 delegates needed to lock up the party's nomination before the Republican National Convention. For Republicans, there are 42 delegates up for grabs: 18 for the statewide winner plus 3 for each congressional district. Ted Cruz is polling about 10 percentage points ahead of Trump in the Badger State.

DEMOCRATS: Wisconsin is not a winner-take-all state for Democrats. Hillary Clinton and Bernie Sanders will be competing for 86 delegates being awarded proportionately. With Madison being a large liberal college town, that could prove favorable for the Vermont senator.

VOTER ID: Wisconsin voters must bring a photo ID to the polls. Accepted forms of ID to vote in Wisconsin include a driver's license, state ID card, U.S. passport, military ID, tribal ID, or college ID with proof of enrollment. If you are not yet registered in Wisconsin or your current address doesn’t match the address on your ID, you will also need to bring a bank statement or utility bill.

SUPREME COURT: Voters will also elect a new Wisconsin Supreme Court justice Tuesday. Justice Patrick Crooks died in his chambers in September, and Republican Gov. Scott Walker appointed Rebecca Bradley to fill the seat in December. Bradley is opposed by JoAnne Kloppenburg.

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