Democratic presidential candidates Elizabeth Warren, Bernie Sanders, and Joe Biden take part in the U.S. presidential primary debate in Charleston, S.C., on Feb. 25.
John McCain (R-AZ) prepares to greet supporters during a Veterans rally for U.S. Sen candidate and U.S. Rep. Bill Cassidy (R-LA) at the American Legion Post on October 13, 2014 in Covington, Louisiana. (Sean Gardner/Getty Images)
Then-presidential candidate Donald Trump gives two thumbs at the Republican National Convention on July 21, 2016, in Cleveland, Ohio. (Chip Somodevilla/Getty Images)
STANFORD, CA - DECEMBER 17: Books sit on a shelf at the Cecil H. Green Library on the Stanford University Campus December 17, 2004 in Stanford, California. Google, the internet search engine, has announced a long-term project to put 15 million books from seven of the world's most prestigious libraries online and make them searchable. Included will be the libraries of Harvard, Stanford, the University of Michigan, the New York Public Library and the University of Oxford, including the Bodleian. Books and periodicals will be scanned and project is expected to take six years and cost more than $100 million. (Photo by Justin Sullivan/Getty Images)
