The audience grew more uncomfortable when Brown turned to the candidates who are looking to make Obama a one-term president.
The impersonator took a shot at former Minnesota Gov. Tim Pawlenty, saying Pawlenty missed the conference because "he's having his foot surgically removed from his mouth."
"Don't worry: it's covered under Obamneycare ... along with spinal transplants," Brown said.
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The impersonator joked about Romney's Mormon faith and about polygamy, and Rep. Michele Bachmann's tea party support.
Organizers then cut off Brown's microphone and turned on music. He was shown off the stage.