bq. Moreover, an analysis relating 2012 congressional vote intentions to partisan predispositions and tax policy preferences suggests that supporting increased taxes on the wealthy pushed prospective voters toward favoring Democratic congressional candidates much more strongly than opposing increased taxes on the wealthy pushed them toward favoring Republican congressional candidates. That asymmetry in potential electoral impact will naturally loom larger the closer we get to Election Day.
From Larry Bartels, over at Model Politics. See the whole post.