Given his growing lead in delegates, Donald Trump's main obstacle now may be not another candidate but the prospect of an open convention where no one has the votes for a first-ballot nomination.
Hillary Clinton and Donald Trump won big across the board, but Ted Cruz pulled off a surprise in Oklahoma and Rubio finally won his first state in Minnesota.
Donald Trump won seven Super Tuesday contests. Steve Inskeep talks to former New Jersey Governor Christine Todd Whitman about the results.
Hillary Clinton swept the Southern states voting in Super Tuesday contests, and won by wide margins. Democratic pollster Margie Omero, co-host of the podcast The Pollsters weighs in on the results.
Hillary Clinton and Donald Trump had strong Super Tuesday showings, but their rivals didn't let up. Bernie Sanders won 4 states. Ted Cruz captured three. And, Marco Rubio won the Minnesota caucuses.
Donald Trump has been winning, but not a clear majority of delegates so far. Jonah Goldberg, senior editor at the National Review, tells David Greene his magazine devoted an issue to attacking Trump.
Donald Trump keeps on winning and confounding the Republican Party establishment with his broad coalition of voters. He won seven states on Super Tuesday. Hillary Clinton also won seven.
As part of a showdown over whether Apple must develop a way to unlock the iPhone owned by a San Bernardino shooter, Apple and the FBI faced off Tuesday before members of the House Judiciary Committee.
At issue is whether a Texas law requiring clinics to meet surgical-center standards is aimed at safeguarding women's health, or unconstitutionally limiting a woman's right to terminate a pregnancy.
Scenes from the day, from polling places and campaign events to candidate speeches at some unique venues.
One thing is clear: Democrats and Republicans had very, very different priorities tonight
On the Republican side, Donald Trump is projected to win in Georgia. For the Democrats, Hillary Clinton takes Georgia and Virginia, while Bernie Sanders won in his home state of Vermont.
Bernie Sanders delivered a victory speech to supporters in his home state of Vermont after he was projected to win the Super Tuesday primary there.
NPR's Ari Shapiro interviews Rep. Joaquin Castro of Texas about how things are looking for Hillary Clinton on Super Tuesday. She is projected to win the Democratic primaries in Virginia and Georgia.
Donald Trump is projected to win the Republican primary in Georgia. NPR's Ari Shapiro talks to Ron Nehring, California chairman for the Ted Cruz campaign and formerly the California GOP chairman.
Polls begin to close in about a dozen states voting in the Super Tuesday primaries.
Voters in more than a dozen states headed to the polls Tuesday, casting ballots across the country in the biggest primary day by far.
There are contests in 13 states on Super Tuesday. The NPR politics podcast team looks at how that affects the campaigns' strategies, and whether a day packed with primaries favors particular candidates.
Voters in about a dozen states are going to the polls Today. On the Democratic side, Hillary Clinton is looking to gain a sizable lead in delegates over Bernie Sanders. But Sanders has been focusing on peeling off victories in some key states.
President Obama plans to nominate someone to replace Supreme Court Justice Scalia. But Republican leaders say the Senate won't consider his pick. A White House meeting between the two sides failed to bridge the divide.