The bumper sticker will be a nice companion for the one McCain has on his car: McCain for Democrats.
Knowing him and his obtuseness, he will interpret this drift of democrats to his support as proof that he’s the second coming of Ronald Reagan, based on “ability to attract democrats.”
And, IMO, it will prompt him to drift farther left in his quest to give them good reason to support him, launching yet another flaming bowling ball into the teeth of the conservative base.