As governors’ approval ratings suffer with state budgets, expect a lot of party swapping in ’10.SurveyUSA polled approval ratings for 12 governors in April ’08, October ’08 and April ’09, and their average went from 50 percent to 54 percent to 41 percent over that period. None saw improvement.Read more at FiveThirtyEight, where Nate Silver analyzes the implications for the 2012 race.