Ohio Gov. John Kasich, former Florida Gov. Jeb Bush, Sen. Marco Rubio, R-Fla., businessman Donald Trump, Sen. Ted Cruz, R-Texas, retired neurosurgeon Ben Carson and New Jersey Gov. Chris Christie (L-R) line up at the beginning of a Republican presidential primary debate hosted by ABC News at the St. Anselm College Saturday, Feb. 6, 2016, in Manchester, New Hampshire. David Goldman AP