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Wisconsin Governor Scott Walker speaks during the NRA's Celebration of American Values Leadership Forum at the NRA Annual Meetings and Exhibits April 13, 2012 at the Edward Jones Dome in St. Louis, Missouri. More than 60,000 people are expected to attend the convention, which runs through Sunday. Republican presidential candidate former Massachusetts Governor Mitt Romney, former Speaker of the House Newt Gingrich, and former U.S. Sen. Rick Santorum are all scheduled to speak.
Wisconsin Governor Scott Walker speaks during the NRA's Celebration of American Values Leadership Forum at the NRA Annual Meetings and Exhibits April 13, 2012 at the Edward Jones Dome in St. Louis, Missouri. More than 60,000 people are expected to attend the convention, which runs through Sunday. Republican presidential candidate former Massachusetts Governor Mitt Romney, former Speaker of the House Newt Gingrich, and former U.S. Sen. Rick Santorum are all scheduled to speak.

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    Scott Walker becomes 15th GOP candidate

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Scott Walker becomes 15th GOP candidate

John King, Julie Pace and Molly Ball discuss the Wisconsin governor's Monday launch plans and his chances in the crowded GOP race.

Scott Walker becomes 15th GOP candidate

John King, Julie Pace and Molly Ball discuss the Wisconsin governor's Monday launch plans and his chances in the crowded GOP race.