Well, I'm sure they'd be slightly more Laissez-faire, but crazy right-wingers hate free trade too. If you look at the Constiturion Party's website, it says free trade is "being used to foster socialism...". It's hilarious how pathetically stupid these people are. But the BNP would probably do the same thing. I'd say the parties would be led by:
Conservatives-Mitt Romney, with someone more moderate like Charlie Christ or Michael Bloomberg as deputy leader to balance out Romney's very right-wing positions within the party. Would also include people like Mary Landrieu, Harry Reid, Lincoln Chaffee, Evan Bayh, Mark Begich, Mark Warner, and Tim Kaine.
Labour-Err...Nancy Pelosi, or maybe Elizabeth Warren. Van Jones would be okay if it weren't New Labour, but with the New Labour "modernizations", Warren might be the most left-wing person who could viably become leader
Lib Dems-Barack Obama, 'cause he's a right-wing sellout just like Clegg, and I guess you could say that in 2008, his ideology seemed to be left-liberal. Jerry Brown, the Clintons, Al Gore, Dianne Feinstein, and other Dems who aren't blue dogs, but also aren't socialists by any stretch of the imagination.
USIP-The Tea Party. Michelle Bachman, Rick Santorum, and Newt Gingrich all come to mind for leader. I suppose it'd be Bachmann.
ANP-David Duke, though maybe Jan Brewer so they'd have better electoral prospects
Green Party-Jill Stein or Ralph Nadar
Rick Perry would lead the Texan National Party lol.
Where would Ron Paul be in this? I could see him in the USIP.