Sen. Ted Cruz leaves the stage after speaking during the Republican National Convention on Wednesday. Evan Vucci/AP hide caption
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Republican Ted Cruz makes a campaign stop at the Bravo Cafe Monday in Osceola, Ind. The Hoosier State might be Cruz's last chance to stop Donald Trump from getting the nomination. Joe Raedle/Getty Images hide caption
Bernie Sanders and Ted Cruz celebrate with supporters after winning the Wisconsin primary contests on Tuesday. Brennan Linsley and Paul Sancya/AP hide caption
Marco Rubio waves as he boards his bus after a campaign stop in Lakeland, Fla., on Saturday. Gerald Herbert/AP hide caption
(From left) Florida Sen. Marco Rubio, Donald Trump, Texas Sen. Ted Cruz and Ohio Gov. John Kasich before the start of the Republican presidential debate Thursday in Miami. Wilfredo Lee/AP hide caption
John Evans, dressed as Uncle Sam, waits for Ted Cruz to take the stage during an election night watch party in Stafford, Texas on Tuesday. David J. Phillip/AP hide caption
Republican presidential candidate Donald Trump acknowledges his lookalike Colton Jordan, 5, of Cario, Ga., after a rally at Valdosta State University in Georgia on Monday. Andrew Harnik/AP hide caption
Sen. Ted Cruz, R-Texas, prays with a group of supporters after a rally earlier this month in Las Vegas. Jae C. Hong/AP hide caption
A supporter takes a photo of Republican presidential candidate, Sen. Marco Rubio, on Wednesday in Houston. Pat Sullivan/AP hide caption
Republican presidential candidate Donald Trump speaks at his election night party February 20, 2016 in Spartanburg, South Carolina. The New York businessman won the first southern primary decisively. Spencer Platt/Getty Images hide caption
Republican presidential candidates at the final GOP before the South Carolina primary on Saturday at the Peace Center in Greenville, S.C. Spencer Platt/Getty Images hide caption
Florida Sen. Marco Rubio may have finished third, but he had a better-than-expected night in Iowa, thanks in part to larger turnout and evangelical voters. Pete Marovich/Getty Images hide caption
Republican presidential candidate Ted Cruz greets supporters Monday during a caucus night rally in Des Moines, Iowa. Charlie Neibergall/AP hide caption
Republican presidential candidate Donald Trump speaks during a campaign stop Monday at Farmington High School in New Hampshire. John Minchillo/AP hide caption
Former Alaska Gov. Sarah Palin announces her endorsement of Republican presidential candidate Donald Trump in Ames, Iowa, on Tuesday. Al Drago/CQ Roll Call via Getty Images hide caption
Texas Sen. Ted Cruz has surged in the polls since last month's GOP debate. Morry Gash/AP hide caption