Marco Rubio Marco Rubio

Protesters close their eyes in silent prayer as they stand on the South Carolina Statehouse steps during a rally to take down the Confederate flag, Saturday, June 20, 2015, in Columbia, S.C. Rainier Ehrhardt/Associated Press hide caption

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Rainier Ehrhardt/Associated Press

Sen. Lindsey Graham, R-S.C., speaks to members of the media after visiting the memorial site at the Emanuel African Methodist Episcopal Church in Charleston, S.C., where nine people were killed. John Taggart/EPA/Landov hide caption

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John Taggart/EPA/Landov

Predictably, Democrats, Republicans Don't Agree On Charleston Causes, Solutions

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Republican presidential hopeful Sen. Marco Rubio, R-Fla., speaks Wednesday before the Council on Foreign Relations in New York, where he laid out his "Rubio Doctrine." Mary Altaffer/AP hide caption

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Mary Altaffer/AP

4 Questions For Republicans On Foreign Policy

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Republican presidential hopeful Sen. Ted Cruz speaks at the Republican Leadership Summit Saturday in Nashua, N.H. Jim Cole/AP hide caption

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Jim Cole/AP

Candidates And Candidates-To-Be Woo New Hampshire's GOP

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A protester in front of Sen. Marco Rubio's Doral, Fla., office in 2013 urges Rubio to stop opposing the inclusion of lesbian, gay, bisexual and transgender families in the Senate's immigration bill. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images

As Country Changes, Rubio And Republicans Try To Adjust

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Senate Foreign Relations Committee member Sen. Marco Rubio, R-Fla., questions Secretary of State John Kerry on Capitol Hill last month. In an interview with NPR, Rubio reiterated his opposition to President Obama's dealings with Iran and Cuba. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

Republicans Are Making Foreign Policy The Obamacare Of The 2016 Election

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Marco Rubio celebrates onstage with his family in 2010 after winning his U.S. Senate seat in Florida when he was just 39 years old. Now, he's expected to embark on a run for president. Alan Diaz/AP hide caption

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Alan Diaz/AP

Rubio's Path To The Nomination, And 3 Obstacles In His Way

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Sen. Rand Paul, R-Ky., center, meets with members of the Londonderry Fish and Game Club in Litchfield, N.H., on Jan. 14. Paul was one of three GOP presidential hopefuls who attended Sunday's semiannual gathering of David and Charles Koch's donor network in California. Jim Cole/AP hide caption

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Jim Cole/AP