U.S. House candidates Doug Collins and Martha Zoller exchanged ideas on key issues and debated who was the true “establishment” candidate during a televised forum Thursday night.The event was held in Atlanta by the Atlanta Press Club and televised by Georgia Public Television.Collins and Zoller are in a runoff for the Republican nomination for the 9th District seat. Early voting ends today, with runoff election day Tuesday. The winner will face Democrat Jody Cooley in the Nov. 6 general election.Collins, 45, is a three-term state representative from Gainesville.