Republican presidential candidate Donald Trump delivers his nomination acceptance speech to conclude the Republican National Convention in Cleveland. John Moore/Getty Images hide caption
GOP nomination
Big Tex at the State Fair of Texas in Dallas. Patricia Marroquin/Moment Editorial/Getty Images hide caption
5 Reasons Texas Matters More For The GOP Nomination Than Iowa Or N.H.
Republican presidential candidate Donald Trump holds a signed pledge during a news conference in Trump Tower, Thursday, Sept. 3, 2015 in New York. Mark Lennihan/AP hide caption
GOP hopeful Rick Santorum, shown greeting supporters in Minnesota on Tuesday, drew votes in the Feb. 7 contests. But he didn't win any delegates. Craig Lassig/EPA/Landov hide caption