Updated at 2:52 p.m.:
Republican Ann Wagner, who previously announced an exploratory committee for congress, made it official today.
Wagner will run in the Second Congressional District, making her announcement following Akin's official word earlier today.
Akin Expected to Announce Challenge to McCaskill Today
Missouri Congressman Todd Akin may soon be joining the Republican race to challenge Democratic U.S. Sen. Claire McCaskill next year. Akin is expected to announce his Senate candidacy today at a news conference in Creve Coeur.
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