Kimberly Strassel makes an important point at the WSJ today about the folly of not only Romney's singling our the "middle class" as the demographic he's going to champion with his tax policies, but Rick Santorum's proposal to give special credits to people with particular types of jobs (manufacturing) or family structures (children).
Come on, guys. Let's be the party - the movement - that dispenses with all that this-group-that-group preoccupation and works to maximize liberty for everybody.
For one thing, these designations are fluid. People move in and out of income brackets and various other types of life situations all the time.