Despite all the crowing about how the Republican Party is dead and so on, a recent Pew poll shows that since the election self identified Republicans and Democrats have declined as a percentage of voters, Democrats down by 6% and Republicans down by 4%, and independents have increased. In terms of policy preference, there is no consistent movement away from either conservatism or liberalism.
As for opinions about Iraq, support for the US presence there has not changed in 3 years of polling, but opinions of how well things are going there have improved by 10 to 30 points.