The Supreme Court unanimously ruled on Monday that states may count all residents, whether or not they are eligible to vote, when drawing election districts. In doing so, the court upheld the "one person, one vote" principle.
Donald Trump can clinch a majority of the delegates he needs to win the Republican presidential nomination. But his margin of error is razor thin, and even in a best case scenario, he likely won't get there until the last day of the primary season.
Democrats have a close race in Wisconsin, which votes in its primary on Tuesday.
Both campaigns say there will be a debate before the important New York primary in two weeks, but they haven't agreed on a date yet.
The challenge to the longstanding definition argued that only people who are eligible to vote should count in drawing voting district lines and other government purposes. The court was unanimous.
The court ruled unanimously that all persons residing in a particular state or district should be counted — not just those who are eligible to vote — when drawing legislative districts.
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.
The polls could be wrong of course, but they do comport with signals from the ground: Wisconsin is Cruzing and feeling the Bern, and both could ride the thermal updraft for the next two weeks.
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.
Brandon Judd, president of the National Border Patrol Council, talks to Mary Louise Kelly about his group's endorsement of GOP front-runner Donald Trump.
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.
How much can a president take credit for job growth in the private sector?
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.
Wisconsin voters go to the polls on Tuesday. In both the Republican and Democratic races, the frontrunners could face upsets in this state.
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.
At the end of this Congress, more than one-third of the historic 2010 "tea party" freshman class will be gone from the U.S. House.
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.
There has been a lively debate in political and media circles about the extent to which Donald Trump's rise has been fueled by news media.
At the end of the nuclear security summit he hosted, President Obama slammed Donald Trump for Trump's recent comments about nuclear weapons.