Sen. Ted Cruz (R-Texas) -- Announced March 23, 2015(01 of20)
Open Image ModalSen. Ted Cruz (R-Texas), his wife Heidi and their two daughters wave on stage after he announced his campaign for president, Monday, March 23, 2015 at Liberty University, in Lynchburg, Va. Cruz, who announced his candidacy on Twitter in the early morning hours, was the first major candidate to officially enter 2016 race for president. (credit:ASSOCIATED PRESS)
Sen. Rand Paul (R-Ky.) -- Announced April 7, 2015(02 of20)
Open Image ModalSen. Rand Paul (R-Ky.) announces the start of his presidential campaign, Tuesday, April 7, 2015, at the Galt House Hotel in Louisville, Ky. Paul launched his 2016 presidential campaign Tuesday with a combative message against both Washington and his fellow Republicans, declaring that \"we have come to take our country back.\" (credit:ASSOCIATED PRESS)
Former Secretary Of State Hillary Clinton -- Announced April 12, 2015(03 of20)
Open Image ModalDemocratic presidential candidate and former U.S. Sectetary of State Hillary Clinton speaks to employees of Whitney Brothers, an educational furniture manufacturer, at a round table discussion on April 20, 2015 in Keene, New Hampshire. This marked Clinton\'s first major political event in New Hampshire after announcing her campaign for president a little over a week before. (Photo by Andrew Burton/Getty Images) (credit:Andrew Burton via Getty Images)
Sen. Marco Rubio (R-Fla.) -- Announced April 13, 2015(04 of20)
Open Image ModalSen. Marco Rubio (R-Fla.) smiles as he speaks to supporters as he announces that he is running for the Republican presidential nomination, during a rally at the Freedom Tower, Monday, April 13, 2015, in Miami. (AP Photo/Wilfredo Lee) (credit:ASSOCIATED PRESS)
Sen. Bernie Sanders (I-Vt.) -- Announced April 30, 2015(05 of20)
Open Image ModalSen. Bernie Sanders (I-Vt.) speaks to the media about his agenda in running for president, Thursday, April 30, 2015, on Capitol Hill in Washington. (AP Photo/Jacquelyn Martin) (credit:ASSOCIATED PRESS)
Ben Carson -- Announced May 4, 2015(06 of20)
Open Image ModalBen Carson announces his candidacy for president during an official announcement in Detroit on Monday, May 4, 2015. Carson, 63, a retired neurosurgeon, begins the Republican primary as an underdog in a campaign expected to feature several seasoned politicians. (credit:ASSOCIATED PRESS)
Carly Fiorina -- Announced May 4, 2015(07 of20)
Open Image ModalFormer Hewlett-Packard CEO Carly Fiorina speaks at the Iowa Faith & Freedom 15th Annual Spring Kick Off, in Waukee, Iowa, Saturday, April 25, 2015. (credit:ASSOCIATED PRESS)
Former Arkansas Gov. Mike Huckabee (R) -- Announced May 5, 2015(08 of20)
Open Image ModalFormer Arkansas Gov. Mike Huckabee salutes supporters in Hope, Ark., after announcing Tuesday, May 5, 2015, that he is seeking the Republican nomination in the race for president. (credit:ASSOCIATED PRESS)
Former Sen. Rick Santorum (R-Pa.) -- Announced May 27, 2015(09 of20)
Open Image ModalFormer U.S. Sen. Rick Santorum announces his candidacy for the Republican nomination in the 2016 presidential race on Wednesday, May 27, 2015 in Cabot, Pa. (AP Photo/Keith Srakocic) (credit:ASSOCIATED PRESS)
Former New York Gov. George Pataki (R) -- Announced May 28, 2015(10 of20)
Open Image ModalFormer New York Gov. George Pataki announces his plans to seek the Republican nomination for president, Thursday, May 28, 2015, at the historic town hall in Exeter, N.H. (AP Photo/Jim Cole) (credit:ASSOCIATED PRESS)
Former Maryland Gov. Martin O'Malley (D) -- Announced May 30, 2015(11 of20)
Open Image ModalFormer Maryland Gov. Martin O\'Malley speaks during an event to announce his candidacy for a presidential campaign May 30, 2015 at Federal Hill Park in Baltimore, Maryland. O\'Malley was the third Democrat, after former U.S. Secretary of State Hillary Clinton and Sen. Bernie Sanders (I-VT), to throw his hat in the ring for the Democratic nomination. (Photo by Alex Wong/Getty Images) (credit:Alex Wong via Getty Images)
Sen. Lindsey Graham (R-S.C.) -- Announced June 1, 2015(12 of20)
Open Image ModalCENTRAL, SOUTH CAROLINA - JUNE 1: U.S. Sen. Lindsey Graham (R-SC) gives a speech where he announced his candidacy for United States President during an outdoor event on June 1, 2015 in Central, South Carolina. Graham is the ninth Republican to join the race for president in 2016. (Photo by Jessica McGowan/Getty Images) (credit:Jessica McGowan via Getty Images)
Former Rhode Island Gov. Lincoln Chafee (D) -- Announced June 3, 2015(13 of20)
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Former Texas Gov. Rick Perry (R) -- Announced June 4, 2015(14 of20)
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Former Florida Gov. Jeb Bush (R) -- Announced June 15, 2015(15 of20)
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Business Mogul Donald Trump (R) -- Announced June 16, 2015(16 of20)
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Louisiana Gov. Bobby Jindal (R) -- Announced June 24, 2015(17 of20)
Open Image Modal (credit:Darren McCollester via Getty Images)
New Jersey Gov. Chris Christie (R) -- Announced June 30, 2015(18 of20)
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Former Sen. Jim Webb (D-Va.) -- Announced July 2, 2015(19 of20)
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Wisconsin Gov. Scott Walker (R) -- Announced July 13, 2015(20 of20)
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