Tamara Keith

Bill Clinton sparred with protesters Thursday at a campaign event for his wife in Philadelphia. Clinton defended the 1994 crime bill that many blame for the mass incarceration of African-Americans.

The Democratic presidential race has turned negative. Bernie Sanders now says Hillary Clinton isn't qualified to be president. NPR explores how the race, which has been relatively civil, got to this point.

Bernie Sanders racked up another win in Wisconsin but did not make much of a dent in Hillary Clinton's lead in delegates. NPR explores what this means for the Democratic presidential race going forward.

Exit polling shows Sens. Ted Cruz and Bernie Sanders leading in the state, says NPR's Ron Elving.

Voters in Wisconsin weigh in Tuesday in the Democratic and Republican presidential primaries.

Democratic presidential candidates Hillary Clinton and Bernie Sanders agreed on Monday to meet for a debate on April 14 ahead of the New York primary.

Democrats have a close race in Wisconsin, which votes in its primary on Tuesday.

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.

Sanders and his supporters are trying to change America, not the positions of another candidate. But his issues are helping to define the Democratic primary.

Democratic presidential candidate Bernie Sanders insists he isn't in the race to move Hillary Clinton to the left. But progressive activists say he's doing just that.

In 1996, NPR's Scott Simon interviewed first lady Hillary Clinton about her battles with Republicans and her own time as a young booster of Barry Goldwater.

Democrat Hillary Clinton won Ohio, Florida, North Carolina and Illinois. Missouri is too close to call for both the Democrats and Republicans.

The Democratic and Republican presidential candidates await results in the Ohio and North Carolina primary contests.

Bernie Sanders is looking to keep up his momentum from his win over Hillary Clinton in Michigan last week as five more large states vote on Tuesday.

Hillary Clinton is looking to hold off Bernie Sanders in Tuesday's major primaries, but Sanders is looking for momentum after his surprise win in Michigan last week.

The Vermont independent won the Michigan primary, in part, because of strong support from white men, upset about stagnant wages and jobs sent offshore. Now, that demographic could help him win Ohio.

After defeating Hillary Clinton by a hair in the Michigan primary, Bernie Sanders will debate his rival in Miami on Wednesday night.

As expected, Hillary Clinton won the Mississippi primary. Michigan was the bigger prize and polls leading into the primary had Clinton up by double digits, but that's not how it turned out.

Democratic pollster Margie Omero and Republican strategist John Feehery look at what the voter turnout numbers mean following Tuesday's primary contests.

Democrats Hillary Clinton and Bernie Sanders are on the ballot in two more primaries Tuesday in Michigan and Mississippi. Clinton could significantly extend her delegate lead over Sanders with wins in both states.