The type of person who used to be a Reagan Democrat, now mid-morph to Palin Democrat (no, not even a PUMA of '08), that's the guy, or gal, who is outraged at the Town Hall meetings.
While this is a guess on my part, have you noticed that every time someone mentions their party affiliation it's a Dem? And besides--who else would get this enraged?
Conservatives were engaged last fall, and angry then, but have certainly not been taken by surprise by it all. No, a lot of this is the hot patriotism of those freshly convinced of a mortal threat to our nation.