Bernie Sanders announced his presidential bid Thursday. Though he'll challenge Hillary Clinton for the Democratic nomination, his candidacy could actually help hers. Getty Images hide caption

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Sen. Marco Rubio spoke at the an Iowa Faith and Freedom Coalition meeting last weekend. Scott Olson/Getty Images hide caption

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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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President Obama with Israeli Prime Minister Benjamin Netanyahu at the White House in 2013. The two have never had a warm and fuzzy relationship. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP