Obviously, Republicans should oppose Obama and the Democrats on substance, sharply if there are (real) sharp disagreements, which is the case on many policies. But the rejectionist strategy they're following (oppose Dems at every turn, regardless of policy difference) is, I continue to believe, a real mistake.
However, no one is going to listen to advice like that. Republicans are invested in a particular interpretation of 1994, and yesterday's election is only going to reinforce that interpretation, whether it's correct or not.
Bookmarks