Ohio Gov. John Kasich is the final major GOP candidate expected to enter the race for president. Jim Cole/AP hide caption
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Wisconsin Gov. Scott Walker's rise as a national political star has been swift. He was elected statewide three times in four years. Chip Somodevilla/Getty Images hide caption
Former Virginia Gov. Jim Gilmore said Wednesday he is running for the GOP nomination for president and will make an official announcement the first week in August. Jim Cole/AP hide caption
Former Sen. Jim Webb speaks at the National Sheriffs' Association annual conference last month in Baltimore. Mark Wilson/Getty Images hide caption
New Jersey Gov. Chris Christie hopes to reset his political fortunes with his presidential announcement on Tuesday. Scott Olson/Getty Images hide caption
Louisiana Gov. Bobby Jindal announced his bid for the Republican presidential nomination on Wednesday. Rainier Ehrhardt/AP hide caption
Donald Trump waves as he walks offstage after speaking at the Iowa Republican Party's Lincoln Dinner last month. Charlie Neibergall/AP hide caption
Jeb Bush speaking in Germany days before his expected official launch of his presidential campaign. Wolfgang Kumm/AFP/Getty Images hide caption
Former Texas Gov. Rick Perry speaks at the Iowa Faith & Freedom 15th Annual Spring Kick Off in Iowa in April. Nati Harnik/AP hide caption
Then-Republican Sen. Lincoln Chafee marching in a parade in Woonsocket, R.I., in 2006. Darren McCollester/Getty Images hide caption
Graham speaks to reporters in December 1998 about the impeachment trial against President Bill Clinton. Tim Sloan/AFP/Getty Images hide caption
Martin O'Malley performs with his Irish rock group, O'Malley's March, in Baltimore in 2002. Alex Dorgan-Ross/AP hide caption
Former New York Gov. George Pataki speaks during the Iowa Agriculture Summit in March. Charlie Neibergall/AP hide caption
Rick Santorum, R-Pa., won Iowa in 2012. He faces a more crowded field this time around. J. David Ake/AP hide caption
In this handout photo from Singapore's Raffles Hospital, Dr. Keith Goh and Carson operate on 29-year-old conjoined twins Ladan and Laleh Bijani in 2003. Getty Images hide caption
Carly Fiorina at a luncheon Tuesday with New Hampshire Republican lawmakers. Jim Cole/AP hide caption
Bernie Sanders celebrates his victory in the race for U.S. Congress in Burlington, Vt., in 1990. Rob Swanson/AP hide caption
Huckabee ran the Marine Corps Marathon in 2005. Kevin Wolf/AP hide caption
Rubio in 2008 as Florida House speaker, unveiling a portrait that would hang in the House chamber. Phil Coale/AP hide caption
Hillary Clinton in June 1969 at the Rodham family home. She was featured in a Life magazine story called "The Class of '69." Lee Balterman/The LIFE Premium Collection/Getty Images hide caption
Sen. Rand Paul examines a patient's eyes in his Bowling Green, Ky., office in 2010. Paul, an ophthalmologist, worked on his father's campaign while in medical school. Joe Imel/AP hide caption
Sen. Ted Cruz speaks at the International Association of Firefighters forum in Washington, D.C., earlier this month. Pablo Martinez Monsivais/AP hide caption