Ron Paul Hopes to Crash McCain's Party

Paul is also insisting on a speaking opportunity at the convention, which the GOP has yet to offer.

As for Barr, his spokesman says that the Libertarian Party typically attracts more voters from the Republican side.

"Any third party can be a potential spoiler," Barr spokesman Andrew Davis says. "Ross Perot did it in 1992. Our party competes just like any other party does."