Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, center, arrives for U.S. President Barack Obama's State of the Union address to a joint session of Congress at the Capitol in Washington, D.C., U.S., on Tuesday, Jan. 12, 2016. Obama said he regrets that political divisiveness in the U.S. grew during his seven years in the White House and he plans to use his final State of the Union address Tuesday night to call for the nation to unite. Photographer: Drew Angerer/Bloomberg via Getty Images