Published On: Nov 08 2012 11:41:49 AM ESTUpdated On: May 27 2015 11:34:44 AM EDT
Rick Santorum, the former Pennsylvania senator who mounted an unexpectedly strong bid for the Republican nomination in 2012, is making another bid for the White House. Santorum is formally launching his campaign May 27 in Pennsylvania, spokesman Matt Beynon confirmed to CNN.
Former Arkansas Gov. Mike Huckabee has been actively preparing for a presidential bid, traveling to early primary states and fleshing out his political team.
Retired physician Ben Carson announced his candidacy for president of the United States on May 4.
Former Hewlett Packard executive Carly Fiorina announced on May 4 she will seek the Republican nomination for president with a campaign that figures to stress economic and gender issues.
Sen. Bernie Sanders (I-Vermont) kicked off his dark horse campaign for the Democratic nomination on April 30 with an email to supporters and a press conference outside the U.S. Capitol.
Former Rhode Island Gov. Lincoln Chafee said on April 16 he's running for the Democratic nomination for president, just a week after announcing he formed an exploratory committee.
Marco Rubio (Republican) -- The Florida senator says he is running for president and is "uniquely qualified" to talk about the future, according to CNN.
Hillary Clinton (Democrat) -- The former secretary of state launched her presidential candidacy April 12.
On April 7, Kentucky Republican Sen. Rand Paul formally announced that he will seek the presidency.
Sen. Ted Cruz officially announced his candidacy for the 2016 presidential race on March 23.
On March 20, Donald Trump announced that he formed an exploratory committee to examine a possible run for president in 2016.
Sen. Lindsey Graham carried the night at the South Carolina GOP's annual Silver Elephant Dinner in Columbia on May 1, dropping serious hints about his potential White House bid.
Chris Christie (Republican) -- The New Jersey governor turned down pleas to run in 2012. Blunt and sometimes partisan, he's worked effectively with a Democratic legislature and has been praised for his response to Superstorm Sandy.
Joe Biden (Democrat) -- The vice presidency gives Biden an unrivaled platform to position himself for 2016, but his age (he would be 74 in 2016) and his penchant for the occasional indelicate remark may be big liabilities.
Paul Ryan (Republican) -- Despite losing the 2012 election as Mitt Romney's running mate, Ryan kept his seat in the House of Representatives, and remains on the radar for running in 2016 as a top fiscal conservative.
Cory Booker (Democrat) -- Newark's heroic mayor is a staple on cable news and the Sunday shows who has parlayed that exposure to build a national profile from the unlikely perch of a big-city mayor. Known for his accessibility and tireless campaigning, he holds degrees from Stanford, Oxford and Yale Law School.
Jeb Bush (Republican) -- The former governor of Florida acted as Mitt Romney’s most powerful surrogate there toward the end of the 2012 race and has expressed regret that timing issues prevented him from making a run of his own at the Oval Office.
Andrew Cuomo (Democrat) -- Cuomo was thrust into the national spotlight almost from the moment he was elected governor of New York, given his political pedigree: his father, Mario, was often mentioned as a potential White House candidate during his tenure as New York governor but never pulled the trigger.
Martin O'Malley, the former governor of Maryland, isn't necessarily a household name, but he's been traveling the country raising money for Democratic gubernatorial candidates in his capacity as chairman of the Democratic Governors Association and has become a staple of the Sunday morning talk shows.
Sarah Palin (Republican) -- She was a newbie to the national stage as John McCain's running mate in 2008, but some Republicans believe Palin has matured since then and still draws big crowds with GOP women.
Deval Patrick (Democrat) -- The Massachusetts governor brought the house down at the Democratic National Convention with a rousing defense of the president that sought to paint deep distinctions between Democrats and the GOP. He attended a big fundraising event for the Iowa Democratic Party earlier this year, and his close ties to Obama could give him access to the president’s vast network of supporters.