COLUMBIA, SC - FEBRUARY 18: Republican presidential candidate Jeb Bush speaks to an audience of voters on February 18, 2016 in Columbia, South Carolina. Bush, who is running as a moderate, campaigned with his brother, former President George W. Bush, last Monday in an attempt to raise his polling numbers before Saturday's primary. (Photo by Spencer Platt/Getty Images)
COLUMBIA, SC - FEBRUARY 18: Republican presidential candidate Jeb Bush speaks to an audience of voters on February 18, 2016 in Columbia, South Carolina. Bush, who is running as a moderate, campaigned with his brother, former President George W. Bush, last Monday in an attempt to raise his polling numbers before Saturday's primary. (Photo by Spencer Platt/Getty Images) Spencer Platt Getty Images
COLUMBIA, SC - FEBRUARY 18: Republican presidential candidate Jeb Bush speaks to an audience of voters on February 18, 2016 in Columbia, South Carolina. Bush, who is running as a moderate, campaigned with his brother, former President George W. Bush, last Monday in an attempt to raise his polling numbers before Saturday's primary. (Photo by Spencer Platt/Getty Images) Spencer Platt Getty Images