There's more than a grain of truth to this.
And in fact, in my view, this mantra of asking people to vote for you just so as not to vote for the other guy is basically what the GOP offers, in every respect, this year.
None of the GOP candidates is running a campaign based on why they SHOULD be president. Instead, their campaigns seem solely to advertise and have as their mainstays why someone else SHOULD NOT be president.
And that's broken down between attention either on Obama or their fellow nomination seekers. No one seems to be focused on what he would do that makes him worthy.
(I'll give RP some credit on that score, he's better than the rest about it.)
Not sure that approach is what people want right now. They want solutions, they want to know what you'll do to help them, not just more complaining about what everyone else is doing to screw them.