How the border wall might keep undocumented migrants in the country; a study measures the effects of voter ID laws on minority turnout; and what Bey's Grammy snubs illustrate about race and merit.
More than 500 monitors and observers will watch polling sites in 28 states, looking for voting rights violations such as discrimination against voters because of their race or language.
Americans strongly prefer primary elections open to all voters but it's tough to move away from caucuses and closed primaries even in states where there's lots of unhappiness with the current system.
Greggor Ilagan, a Hawaii politician running for higher office, used Tinder to reach potential voters. Now, says NPR's Scott Simon, Ilagan is taking a more traditional approach: walking door to door.
Who is the Trump coalition? Working-class white men and core Republicans find his straightforward style and nonpolitician approach refreshing. That means he could have staying power in this race.