HENDERSON, Nev. — Four years ago, an angry and dispirited educational database expert named Carl Bunce walked out of Nevada’s state Republican convention after party leaders shut down the proceedings rather than let Representative Ron Paul’s supporters nominate delegates for the national convention in St. Paul.

Mr. Bunce and a handful of other Paul backers made the trip to Minnesota, but he said that once there they were harassed by other Republicans who threatened to tear off their Paul buttons and even trailed them into bathrooms.

Today, Mr. Bunce, 35, is running Mr. Paul’s Nevada campaign from a strip mall in this Las Vegas suburb. But this time, he and other Paul supporters are in the vanguard of the Nevada Republican Party: After the ugly scene at the state convention, they decided to work with the party that they felt had treated them as pariahs. It took time, and some rivalries remain intense, but now Mr. Paul’s Nevada backers are part of the state Republican machinery.

“Why commit suicide, and why protest like crazy people?” Mr. Bunce remembers thinking after being slighted at the convention in St. Paul. “We decided to choose our battles, and we moved into the party. To get involved in an organization, you have to be part of it.”