Televisions display a political ad from 2011 in Iowa. Chip Somodevilla/Getty Images hide caption

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Do TV Attack Ads Work Anymore?
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Donald Trump made a stop in Lawrenceville, N.J., last week and is heading out to several more states that vote on June 7. Eduardo Munoz Alvarez/AFP/Getty Images hide caption

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Trump To Campaign In Final Primary States, Raising Cash Along The Way
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Sen. Bernie Sanders, an independent from Vermont, speaks during a campaign event in Los Angeles, Calif., on March 23. Patrick T. Fallon/Getty Images hide caption

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Making Democrats' Primaries More Open Could Be Harder Than You Think
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Democratic presidential candidate Bernie Sanders addresses a rally Wednesday at the Santa Clara County Fairgrounds in San Jose, Calif. The senator's campaign is intently focused on a big win in the state on June 7, and has poured money into TV ads there. Josh Edelson/AFP/Getty Images hide caption

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Hillary Clinton addresses a town hall hosted by the AFL-CIO in Detroit in 2007. During the 2008 campaign, Clinton said the U.S. should take a timeout on trade deals after supporting NAFTA in the 1990s. Carlos Osorio/AP hide caption

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Evolution Or Expediency? Clinton's Changing Positions Over A Long Career
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This image released by IFC Films shows Anthony Weiner in a scene from the documentary, "Weiner." AP hide caption

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Beyond Scandalous Selfies: Documenting Anthony Weiner's Downfall
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Donald Trump is introduced by National Rifle Association executive director Chris Cox (left) and NRA executive vice president Wayne LaPierre on Friday at the organization's convention in Louisville, Ky. Mark Humphrey/AP hide caption

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The NPR Politics team tapes its podcast in front of a studio audience at NPR headquarters in Washington, D.C. Meg Kelly/NPR hide caption

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Politics Podcast: The Team Goes Live!
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Donald Trump arrives at the Republican National Committee headquarters on Capitol Hill last week to meet with House Speaker Paul Ryan and other GOP leaders. Nicholas Kamm/AFP/Getty Images hide caption

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'Highly Sophisticated Killers' No More. Trump Embraces Big Donors
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Ships transporting containers like these at the Port of Tacoma, Washington, last year carry the goods at issue in the TPP deal. A new report says the trade pact would boost the U.S. economy, but only by a modest amount. Ted S. Warren/AP hide caption

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