Mara Liasson

In past elections, sitting presidents haven't often stuck their neck out for the next in line, but Obama likely will be a valuable player in Clinton's campaign going forward.

President Obama is expected to endorse Hillary Clinton for president this week. He will be the rare two-term president to be welcome and active on the campaign trail.

Donald Trump shows no sign of backing off his racially charged criticism of a federal judge, even as he comes under increasing pressure from leaders in the Republican Party.

The likely Democratic nominee eviscerated Trump in a speech Thursday. It was aimed not just as Democrats, but Republicans, as Clinton is set to take on Trump this fall.

The scandals of the 1990s are back as likely GOP presidential nominee Donald Trump dubs likely Democratic nominee Hillary Clinton an enabler of her husband's extra marital affairs.

Donald Trump says he's rewritten the rules of media coverage and political advertising — he points to his primary victories. We examine whether that might be the case in the general election as well.

Donald Trump and Hillary Clinton will be picking very different running mates. Here are 14 people in six categories they could choose from.

Donald Trump has a vice presidential search in full motion, and the names being discussed reveal some weaknesses the apparent GOP nominee is looking to shore up on his ticket.

Donald Trump won GOP primaries in West Virginia and Nebraska. Democrats went to the polls in Nebraska, but they awarded convention delegates back in March. Sanders won the West Virginia primary.

"I don't think Hillary Clinton wants to do anything in one sentence," says former Obama strategist David Axelrod. "That's the problem, right?"

Presidential front-runners Donald Trump and Hillary Clinton look ahead to the general election after the Indiana primary. Trump is now the likely GOP nominee after Ted Cruz dropped out Tuesday and John Kasich is expected to suspend his bid Wednesday.

The last polls in Indiana have closed, and Donald Trump is projected to win the GOP primary. On the Democratic side, the race between Bernie Sanders and Hillary Clinton is still too close to call.

Voters in Indiana are at the polls Tuesday in a presidential primary that could largely determine the outcome of the GOP race, while Bernie Sanders fights on to influence Democrats.

Sen. Ted Cruz announced Wednesday former Hewlett-Packard CEO Carly Fiorina will join his ticket as a candidate for vice president. Cruz is making a last-ditch effort to deny Donald Trump the Republican nomination.

Five delegate-rich states on the East Coast's "Acela corridor" vote Tuesday. Can front-runners Donald Trump and Hillary Clinton wrap up their respective nominations?

Populism has been the biggest force this election year. What lasting effect might populism have on both Democrats and Republicans — even after Bernie Sanders and Donald Trump have left the scene?

Primary voters in New York were very good to the front-runners of both parties. Hillary Clinton and Donald Trump were big winners — helping both in their efforts to clinch their party's nomination.

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

Presidential front-runners Hillary Clinton and Donald Trump are hoping to solidify their leads in New York Tuesday, and an upset in either contest could have dramatic consequences.

Democratic presidential candidates Hillary Clinton and Bernie Sanders squared off in New York Thursday night — ahead of that state's crucial primary on Tuesday. They exchanged sharp attacks.