Obama's Long and Evolving Enemies List

(By Chris Stirewalt, FoxNews.com) - Since taking office President Obama and his team have been through a litany of Republican targets before the current crusade against Karl Rove, Ed Gillespie and the U.S. Chamber of Commerce. Going back to the early weeks of the Obama administration, Power Play can detect a shifting and sometimes obscure demonology of the president's political foes.

Lots of Republicans have criticized President Obama or Democratic policies over the past two years, but the administration has been selective about deciding which criticism to answer, and which to not elevate by response.