Sen. Bernie Sanders raised $44 million in March, nearly all of it in tiny increments. Sanders says his fund-raising strategy guarantees independence from big-money interests.
Renee Montagne talks to Kei Kawashima-Ginsburg of Tufts University about the impact young voters have been having in the primary elections, and what that might mean in Tuesday's Wisconsin primary.
Wisconsin's primary is the only presidential contest this week. Mary Louise Kelly talks to columnist and commentator Cokie Roberts and Robert Costa of The Washington Post.
Republican politicians up for election are scrambling: What if Trump leads the ticket? NPR's Rachel Martin asks strategist Rob Jesmer how candidates are addressing the Trump issue.
Muslim voters say they're disheartened with some GOP candidates' comments about their faith this presidential campaign. But, they're trying to turn that disappointment political engagement.
Both Republican and Democratic primaries are being held in Wisconsin on Tuesday. Donald Trump and Hillary Clinton face different kinds of challenges in the state to maintain their leads.
Trump has gone on the attack against Wisconsin Gov. Scott Walker in his home state this week. But that could be a big political miscalculation heading into Tuesday's primary.