I think that with $2 billion, Bloomberg could drum up some support. His whole platform would be, "Look. The rest of these chumps are amateurs. What has Obama ever done? Hilary? Huckabee? I pulled myself up by my bootstraps, built a media and business empire, made myself $6 billion. C'mon, people. Elect an adult for president."
That would undoubtedly (and justifiably) hold some sway with voters. This would be especially true if the Republicans put up Huckabee - the fiscal republicans would shift to Bloomberg. Democrats might shift towards a guy who has actually done something, instead of any of the three front runners they have.
Paul would be poised to do well in this environment because he is an idea guy saying, "Let's return to the first principles, and not cynically elect a rich businessman." I'm just curious, as I asked above, whether Paul could be convinced to go 3rd (4th) party if he didn't get the Republican nod, and whether running as the Libertarian candidate would get him on the ballot in 50 states.