A new Salon column by UMBC political science professor Thomas F. Schaller responds to what Romney strategist Eric Fehrnstrom called “hit[ting] a reset button for the fall campaign.” Moving from the primary to the general election, Fehrnstrom remarked, “everything changes. It’s almost like an Etch-A-Sketch. You can kind of shake it up, and we start all over again.” Schaller argues that the Etch-a-Sketch metaphor is apt in that Romney aspires to “invite all center-right voters, be they hardcore conservatives or libertarian Republicans or fence-sitting moderates, to compose whatever sketch of him they find most appealing — and then vote, accordingly, for …