Rep. Debbie Wasserman Schultz (from left), Sen. Marco Rubio and Sen. John McCain. Gaston De Cardenas/AFP/Getty Images; Joe Raedle/Getty Images; Patrick T. Fallon/Bloomberg via Getty Images hide caption

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Gaston De Cardenas/AFP/Getty Images; Joe Raedle/Getty Images; Patrick T. Fallon/Bloomberg via Getty Images

Sen. John McCain, R-Ariz., and Sen. Marco Rubio, R-Fla., talk on Capitol Hill in 2014. Both are expected to win their primaries for re-election Tuesday. Carolyn Kaster/AP hide caption

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Carolyn Kaster/AP

Incumbents Poised For Big Wins Despite All The Attention On Outsiders

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The pills displayed above by the Cuyahoga County (Ohio) Medical Examiner's Office are fentanyl being sold illicitly as the drug Oxycodone. Fentanyl, a powerful opiate, is the same drug believed to have caused Prince's death. Lawmakers are debating ways to cut down on its use. AP/Cuyahoga Medical Examiner's Office hide caption

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AP/Cuyahoga Medical Examiner's Office

An American flag flies at half-staff outside the U.S. Supreme Court after the death of Justice Antonin Scalia. The fight to replace him could be historic, resulting in the longest vacancy in history. Brendan Smialowski/AFP/Getty Images hide caption

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Brendan Smialowski/AFP/Getty Images

President Obama has reason to smile. He's now just three votes shy of being able to sustain a veto of a resolution of congressional disapproval of his Iran nuclear deal — that is, of being able to advance the deal over Republican objections. Saul Loeb/AFP/Getty Images hide caption

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Saul Loeb/AFP/Getty Images

Sen. Ted Cruz prays before the start of his Religious Liberty Rally last weekend in Des Moines, Iowa. The event was part of Cruz's push to energize evangelical voters. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

Ted Cruz Rallies Evangelicals In Campaign To Defund Planned Parenthood

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Rep. Ed Perlmutter shakes hands with Carlyn Meyer and other members of the groups J-Street and MoveOn.org as they urge him to support the Iran nuclear deal at an event in Denver. J-Street plans to spend about $5 million on ads in this fight, which is vastly dwarfed by the $20 million to $40 million from groups like AIPAC that oppose the agreement. Jason Bahr/Getty Images hide caption

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Jason Bahr/Getty Images

Lobbyists Spending Millions To Sway The Undecided On Iran Deal

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Marine Corps Commandant Gen. Joseph Dunford Jr. testifies Thursday during his Senate Armed Services Committee confirmation hearing to become the chairman of the Joint Chiefs of Staff. Cliff Owen/AP hide caption

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Cliff Owen/AP