I think I've got it! I've figured out Rig's logic, and he just may be right. Start with the premise that all politicians are liars:

McCain is promising to continue to minimize taxes for the very rich, while continuing the war in Iraq until we achieve a clear victory; a sure fire recipe for driving us the last quarter mile into bankruptcy.

Obamma is promising to make the very rich pay at least a somewhat more credible share of taxes.

Since each of them will do the opposite of what he promises, we're screwed if we elect Obama.