Bill Clinton, former U.S. President and husband of 2016 Democratic presidential candidate Hillary Clinton, speaks during a campaign event at Wartburg College in Waverly, Iowa, U.S., on Thursday, Jan. 28, 2016. An old saying that politicians can campaign with poetry but must govern with prose has suddenly become fresh inspiration for Hillary Clinton as she looks to manage an enthusiasm gap with Bernie Sanders days before the Iowa caucuses. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
