This might be worth watching if these guys were just debating to share and explore ideas. However, by definition, this is an if-I-were-president debate, which is silly. None of these guys will ever be president. And there is a reason: These guys are so far out of the mainstream as to be unable, even if everyone fully understood these "candidates" positions, to earn more than a few percent of the vote.
So what is the rational way to bring about the change that any one of these "candidates" advocate? You have to move the country that way. Not jump, move. We got where we are over the last century. Some might even say that the path we are on was entered by the outcome of the Civil War. In any event, the acceleration was caused by progressives collecting in a single party, taking over that party, and giving that party control enough to ratchet up the government involvement in a way that is incredibly hard to deratchet. To undo this, Liberty-lovers, including both conservatives and libertarians, need to collect in a single party, take over that party, and give that party control enough to, step-by-step, deratchet the government control.
The ideals of smaller government and more Liberty are being embraced as never before by the Republican Party, not nearly enough, but more than ever before. We need to keep moving the Republican Party in the right direction, give it power, and make it drag the Republic back in the right direction. This is the precise strategy that was used to drag it in the wrong direction. We need to be as politically smart and effective as those who would take our Liberty.
In this election, that means voting for Romney and, more importantly, against Obama. It means voting for Republican house members and senators. It means being just as tough on them in town halls after the election as we were on their predecessors. It means being active in the candidate selection process in order to eliminate RINOs during the primary season. However, once our slate is settled, we must support the Republican (unless, miraculously, the Dems put up a more Liberty-loving candidate).
You can vote "principle" and let the country slide more in the wrong direction, probably over that cliff, because the more Liberty-loving candidate (who wasn't perfectly Liberty-loving) lost by a handful of votes. Or you can vote realistically and, step-by-step, move the party, then the nation, then the party, then the nation, etc. in the right direction.
Don't be so selfish as to want to do it now for you. Start the process in motion for future generations. "I want it now" is the mantra of the pawns of the collectivists. "I want to build it for the future" is how the Founders and Framers chose to think and how we should now.