Due to the loss of Jim Talent as a potential candidate, The Washington Post's Chris Cillizza has moved Missouri up to the second most likely state to switch parties in 2010.
2. Missouri (R): Secretary of State Robin Carnahan (D) officially entered the open seat race to replace retiring Sen. Kit Bond (R) last week -- a major recruiting coup for national Democrats. Meanwhile, Republicans lost arguably their strongest general election candidate in former senator Jim Talent and seem headed toward a contentious primary fight between Rep. Roy Blunt and state Treasurer Sarah Steelman. (Previous ranking:3)