Obamacare is not like budget battles or homosexual “rights” etc. It is affecting too many people, right now, and will do so for the foreseeable future.
Yes, the GOP-E is unable to exploit this fully, but they aren’t really exploiting it now. It should be a very good year for the GOP despite themselves (as in 2010).
The problem is, Republicans are sitting on their hands while the Democrats strategerize, and fight. By next November the failings of Obamacare will be the result of the House Republicans. Head on over to DU, if you can tolerate it, they are all over the place blaming this on Republicans. Remember, this is a battle for low information voters, and silence isn’t going to win. With that said, I think 2014 is going to be a bad year for all incumbents, not just Democrats.