Matt Letten, who traveled from Michigan to attend the rally, says he was insulted Paul wasn't given more prominence during the Republican convention.
"We did what we did, and we're not just going to sit there and let them walk all over us," he said, adding, "With the money we raised, Ron Paul should have had a speaking role."
Still, though his invitation to party with the GOP seems all but lost in the mail, Paul won't throw his support behind former Georgia Republican Bob Barr running on the Libertarian ticket, who stopped by the rally to court Paul's gathered supporters.
"Our movement has, generally speaking, wanted to stay and build in the Republican Party," Paul said, adding that ideals of limited government and noninterventionist foreign policy are, at heart, Republican.
Outside the arena, Barr told ABCNews.com, "Ron Paul supporters are looking for somebody in the general election ... that they they can support because that person stands for the same freedom agenda that Ron Paul does and that's Bob Barr."
Paul said he hopes his rally will lead to candidates from both major parties talking about the issues that are important to him -- foreign policy and monetary policy, the latter of which he thinks there is just plain too much government involvement, but which he says is ignored by both parties during the campaign.
"They don't even talk about it, and yet this is something we have been talking to young people about," he said.
Paul said he hopes his "revolution" to, according to a T-shirt draped across the podium from which he spoke, "bring the GOP back to its roots," will grow beyond the presidential election.
"If we're worth our salt and our ideas mean anything, this revolution will continue to gain momentum," he said.
ABC News' Lindsey Ellerson and Karen Travers contributed to this report.