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COLUMBIA, SC - FEBRUARY 27: Jennifer Robison, center, signs in to vote in the South Carolina Democratic presidential primary at the Prince of Orange Mall February 27, 2016 in Orangeburg, South Carolina. Voters in 12 states and one U.S. territory will participate in Super Tuesday on March 1. (Photo by Sean Rayford/Getty Images)

COLUMBIA, SC - FEBRUARY 27:  Jennifer Robison, center, signs in to vote in the South Carolina Democratic presidential primary at the Prince of Orange Mall February 27, 2016 in Orangeburg, South Carolina. Voters in 12 states and one U.S. territory will participate in Super Tuesday on March 1. (Photo by Sean Rayford/Getty Images)