Ron Elving Ron Elving is Senior Editor and Correspondent on the Washington Desk for NPR News, where he is frequently heard as a news analyst and writes regularly for NPR.org.

Former Massachusetts Gov. Mitt Romney waves to the crowd as he is introduced at the start of Wednesday night's Republican presidential debate in Mesa, Ariz. Ross D. Franklin/AP hide caption

toggle caption
Ross D. Franklin/AP

Republican presidential hopeful and former U.S. Sen. Rick Santorum speaks to supporters, flanked by his daughter, Elizabeth (left), and wife, Karen. Whitney Curtis/Getty Images hide caption

toggle caption
Whitney Curtis/Getty Images

Jan White, left, Brenda Robertson, center, and Janet Freixas, right, count paper ballots at the headquarters of the Douglas County Republican Party Saturday in Minden, Nev., following county-wide Nevada caucus meetings. Ted S. Warren/AP hide caption

toggle caption
Ted S. Warren/AP

Mitt Romney at his state campaign headquarters Tuesday in Tampa, Fla. Joe Raedle/Getty Images hide caption

toggle caption
Joe Raedle/Getty Images

On Thursday night in Jacksonville, Fla., Mitt Romney (right) went after Newt Gingrich from the start on topics such as immigration and colonizing the moon. Matt Rourke/AP hide caption

toggle caption
Matt Rourke/AP

Iowa caucusgoers deposit their ballots on Jan. 3 at a school in Des Moines. On Thursday, the state GOP said it could not account for all votes from the caucuses. Jewel Samad /Getty Images hide caption

toggle caption
Jewel Samad /Getty Images

Former Utah Gov. Jon Huntsman was surrounded by members of the media during a campaign stop earlier this month in Dover, N.H. Alex Wong/Getty Images hide caption

toggle caption
Alex Wong/Getty Images

Republican presidential candidate former U.S. Sen. Rick Santorum speaks to supporters after announcing that he was endorsed Saturday by the evangelical Christian leaders group. Mark Wilson/Getty Images hide caption

toggle caption
Mark Wilson/Getty Images

Mitt Romney greets supporters in Manchester, N.H., after seizing a second victory in his fight to be the party's presidential nominee. Emmanuel Dunand/AFP/Getty Images hide caption

toggle caption
Emmanuel Dunand/AFP/Getty Images