If Martin does become the GOP nominee, his Democratic challenger could be a familiar foe. Martin narrowly lost to Rep. Russ Carnahan (D) in the 3rd District race last year, but now Carnahan's district has been eliminated in redistricting. Among the options he's considering is running in the 2nd District. The St.Louis Post-Dispatch notes that despite the district's GOP tilt, Carnahan's allies are factoring in the likelihood of a bruising GOP primary. Martin's move leaves the GOP Senate field to former Treasurer Sarah Steelman, who also put up very disappointing first quarter fundraising numbers. Akin, on the other hand enjoyed impressive first quarter numbers and if he joins the Senate race would likely become the front-runner on the GOP side.