If Ron Paul can't even get more than two million counted votes in the Republcan primaries, what makes you think a third party candidate running on Ron Paul's platform could garner the forty million votes necessary to win a three-way presidential race?
First, you've got to remember that a lot of those 2 mil votes Ron Paul would not have won if he had run as a third party candidate. Some of those votes came from partisan Republicans who were convinced to vote for Paul based on the direct mailings and ads.
All third party candidates combined this year got less than 2% of the vote. Despite what polls say, Americans are NOT dissatisfied, disenchanted, or fed up with the two-party system. The majority of Americans LIKE their party and the only way they'll vote for a Constitutional Conservative is if he/she runs in their party.