Hillary cannot win without a Ross Perot type of candidate in the race as an alternative for conservative voters and she knows it. In my opinion, the current dissatisfaction with the GOP sets the stage for an alternative party like Perot in the ‘90s.
Will it be Ron Paul? I don’t know. I wasn’t aware that he has stated he wouldn’t run 3rd party.
As to being nervous. Anything that increases Her Heinous Hillary’s chances of winning makes me very nervous indeed.
You have nothing to fear from Paul, and in fact should be grateful that he's in the race. He is drawing a lot of people who never cared for politics before, independents, and small L libertarians back into the old Reagan coalition.
According to a lot of the maroons around here, Paul has more supporters from the Liberal column than from the Conservative column. If they are to be believed, then he would undoubtedly siphon more votes from Hillary than from the Republican nominee—not that the Republican nominee will necessarily be any less liberal than Hillary, mind you.