That's totally laughable on its face!
Here's the scenario: The Left remains pretty much united. The Right splinters (as usual). What does this get you?
What I'm "sick" of is the notion that some 3rd party can put up enough of a fight to make a difference. Consider this. Say the planets align just right in a Presidential election year and a candidate from, say, the Constitution Party wins the Presidency. Who would still be in Congress? D's and R's. What will ensue then is complete gridlock. What's that called? STATUS QUO. Therefore, going with the odds that are most in your favor is the smartest thing to do. This, and a realization that you never get everything that you want in this life. There's a laundry list of things that I wish G.W. would do. But the chances of him actually doing all that I want are slim and none. You know what else? Slim just left town.
It's a numbers game. If you don't have sufficient numbers to pass what you want passed, the game's over.
Numbers, people. It's all about the numbers.