I've been using a technique that makes using this strategy even easier. When I'm talking to people about it, I tell them about one of my friends or somebody I was talking to that isn't a Ron Paul supporter. I use this other person as a vehicle to deliver the message, so that it doesn't appear to be coming directly from me. I explain that this other person isn't a die-hard Ron Paul supporter, but that they've recently made the decision to support him because they now realize that he's the only one running that has a chance to beat Obama. I then explain why this other person had a change of heart by citing the evidence, the increasing poll numbers, that only he pulls from independents and democrats and all the baggage that will bring each candidate down in the general election.
What's great about using this technique to act out the strategy is that when you're trashing Perry and Romney by bringing all their baggage to light as the reasons they can't win, you aren't raising as much hostility in the person you're talking to because this story and evidence is supposedly coming from one of your friends or somebody you were talking to online. The message is taken more serioiusly and isn't rejected as easily because it doesn't seem to be coming directly from you. You're just using your friend as a vehicle to deliver the message, disarming any potential hostility that might come out of the reasons you suggest for them not being able to win.