(AP) — Herman Cain has run a pizza chain, hosted a talk radio show and sparred with Bill Clinton over health care. He’s never held elected office. Now the Tea Party favorite wants to be president. “In case you accidentally listen to a skeptic or doubting Thomas out there, just be to clear … I’m running for president of the United States and I’m not running for second,” he told a crowd at Centennial Olympic Park on Saturday. Chants of “Herman” erupted. The announcement by the businessman, author and talk radio show host that he was joining the expanding Republican field came after months of traveling around the country to introduce himself to voters.