The Candidates

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Republicans

Formally announced

* Mitt Romney

* Sam Brownback

* Duncan Hunter

Formed exploratory committees

* John McCain

* Rudy Giuliani

* Mike Huckabee

* James Gilmore

* Tommy Thompson

* Tom Tancredo

* Ron Paul

Still possible

* Newt Gingrich

* Chuck Hagel

Democrats

Formally announced

* Hillary Clinton

* Barack Obama

* John Edwards

* Joe Biden

* Chris Dodd

* Dennis Kucinich

* Mike Gravel

Formed exploratory committee

* Bill Richardson

Still possible

* Al Gore

* Wesley Clark
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