Republican South Carolina Gov. Nikki Haley announces her candidacy for a second term in August, with South Carolina Sen. Tim Scott (from left), Govs. Rick Perry of Texas, Scott Walker of Wisconsin, and Bobby Jindal of Louisiana.
Colorado Gov. John Hickenlooper (center) speaks to members of the media Saturday, alongside Sens. Mark Udall (left) and Michael Bennet, after touring flood-damaged areas by army helicopter.