Whenever the democrats propose plans that will help the middle class, the republicans always accuse them of class warfare, primarily because the republicans don't have any substantive arguments to back up their regressive policies. Class warfare can't really be defined, because it doesn't really mean anything.
Barack Obama: My economic plan will benefit the middle class.
Bill O'Reilly: But that's class warfare!
Barack Obama: Um... what does that even mean?
Bill O'Reilly: ummm.... WELL DO IT LIVE!
John McCain: Black Saddam Hussein Osama wantz to fuel class warfare by razin yer taxes!