Tamara Keith

Her positions on issues from trade to same-sex marriage have changed. Critics say it's often because of political expediency, while supporters insist she learns and adapts to new circumstances.

Sen. Bernie Sanders is answering for violence at the Nevada Democratic Party's state convention, where his supporters threw chairs and hurled obscenities as Hillary Clinton claimed the most delegates.

Heroin and prescription opioids are killing more than 100 people a day. It's an issue candidates up and down the ballot are discussing.

Presidential candidates have been confronted by voters over the crisis of opioid abuse and heroin addiction. One major problem is accessing treatment when someone who needs it is ready to receive it.

"We are suspending our campaign," the Texas senator told supporters at an Indianapolis rally. "But hear me now — I am not suspending our fight for liberty." His announcement ends a vitriolic week.

After decades of speaking out against income inequality, the senator found fertile ground for it nationally in this post-recession, post-Occupy era. What's the long-term outlook for his movement?

Hillary Clinton looks to the upcoming primaries to solidify her presidential campaign, while Bernie Sanders vows to stay in the race.

Bernie Sanders won the Democratic primary in Indiana. It wasn't a big enough win to erode Hillary Clinton's massive lead in pledged delegates, but it was a win. Sanders vows to fight on.

After Nancy Glynn got pregnant, she learned her employer didn't offer paid family leave. Then, like many Americans, she discovered it was hard to get by without it.

The campaign says it no longer needs so many staff for the remaining contests left on the calendar, but the move could be a sign of trouble.

There are still seven more weeks of primary contests, but Bernie Sanders says it's unlikely he'll win the nomination and Hillary Clinton is already looking to the general election.

Now that Tuesday's wins virtually ensure Hillary Clinton's nomination, she is doing her best to win over Bernie Sanders' supporters. Sanders is intent on keeping his progressive politics relevant.

Hillary Clinton has started pivoting toward the general election as she hopes to extend her delegate lead Tuesday night out of the reach of Bernie Sanders.

Bernie Sanders is drawing large, energetic crowds, but that hasn't translated into wins in large states. It turns out there is often a disconnect between big rallies and winning elections.

Vermont Sen. Bernie Sanders needs to win all remaining contests by 20-percentage points to overtake Hillary Clinton in the delegate race. How he proceeds will affect the legacy of his campaign.

After a big win in New York Tuesday night, Hillary Clinton moved on to Pennsylvania, where she hopes for victory next week. Bernie Sanders went home to recharge before getting back on the trail.

Donald Trump and Hillary Clinton won big in New York's primary. In addition to correspondent reports, David Greene talks to Democratic pollster Margie Omero and Republican pollster Jim Hobart.

The presidential candidates await results in the New York primaries. NPR has the latest on what we know so far about the results.

New York voters have their chance to determine the direction of the presidential race in their state's contests Tuesday.

If Bernie Sanders is able to pull off an upset in Tuesday's New York Democratic primary, it could be his best shot at transforming the race and damaging Hillary Clinton's chances for the nomination.