What specific words and/or actions of Dobson make you say this?
I've seen Dr. Dobson (whom I respect enormously) several times on TV over the last week. My problem with what he is saying is the tone of his language. Instead of effectively saying, 'If the President doesn't get conservative judges approved, Christians won't show up at the polls,' a rhetorical question such as, 'What do you think Christians will do if, after providing key support in this election, the administration doesn't deliver on its promises: first, to nominate judges who will uphold the Constitution as written and second, to fight for their confirmation?'
You don't solicit support effectively by backing people into a corner.