If Mitt Romney was harmed by the “Etch A Sketch” comment made by one of his advisers or by his loss in Louisiana over the weekend, it doesn’t seem to be preventing him from being in position to win in Wisconsin, which holds its primary on Tuesday. Mr. Romney now leads the polls in Wisconsin, a state that had once seemed relatively favorable for Rick Santorum. A survey from Marquette University, released on Tuesday, gave Mr. Romney an eight-point lead in the state. That is a slightly smaller margin than the one in an earlier Rasmussen Reports poll, which had...