Republican presidential candidates at the final GOP before the South Carolina primary on Saturday at the Peace Center in Greenville, S.C. Spencer Platt/Getty Images hide caption

toggle caption Spencer Platt/Getty Images

Bernie Sanders and Donald Trump deliver victory speeches at their respective watch parties in New Hampshire. Jewel Samad/AFP; Joe Raedle/Getty Images hide caption

toggle caption Jewel Samad/AFP; Joe Raedle/Getty Images

Republican Chris Christie of New Jersey has invested nearly his entire campaign on New Hampshire. A poor result will almost certainly effectively end his candidacy. Robert F. Bukaty/AP hide caption

toggle caption Robert F. Bukaty/AP

Former first lady Barbara Bush, mother of Republican presidential candidate Jeb Bush, campaigns with her son at a town hall meeting at West Running Brook Middle School in Derry, N.H. Jacquelyn Martin/AP hide caption

toggle caption Jacquelyn Martin/AP

Barbara Bush jokes with her son, Republican presidential candidate Jeb Bush, while introducing him at a town hall meeting in Derry, N.H. Jacquelyn Martin/AP hide caption

toggle caption Jacquelyn Martin/AP
Barbara Bush Hits The Trail For Son Jeb Bush
  • Download
  • <iframe src="https://www.npr.org/player/embed/465672072/465672073" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Jeb Bush holds a campaign town hall meeting at the Alpine Club on Monday in Manchester, N.H. Chip Somodevilla/Getty Images hide caption

toggle caption Chip Somodevilla/Getty Images
Heading Into New Hampshire, GOP 'Front-Runners' Are Anything But
  • Download
  • <iframe src="https://www.npr.org/player/embed/465592850/465607223" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Republican presidential candidate Sen. Marco Rubio, R-Fla. holds a rifle during a campaign stop Jan. 15, 2016, at Sturm, Ruger & Co., in Newport, N.H. Matt Rourke/AP hide caption

toggle caption Matt Rourke/AP
Establishment Republicans Scramble To Top Trump
  • Download
  • <iframe src="https://www.npr.org/player/embed/463290751/463290752" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Republican presidential candidate Jeb Bush speaks with NPR's Steve Inskeep on Wednesday in Boston. Kayana Szymczak for NPR hide caption

toggle caption Kayana Szymczak for NPR
Jeb Bush on 'Morning Edition'
  • Download
  • <iframe src="https://www.npr.org/player/embed/461586195/461592800" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Republican presidential candidate Jeb Bush speaks with NPR's Steve Inskeep on Wednesday in Boston. Kayana Szymczak for NPR hide caption

toggle caption Kayana Szymczak for NPR
Jeb Bush Says Voters' Passions For Trump Will Pass
  • Download
  • <iframe src="https://www.npr.org/player/embed/461524482/461568499" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript