Posted on Thu, Jun. 24, 2004 Senate candidates to debate Sunday Collins, Cain will attend; Isakson declines invitation BY RICHARD HYATT Staff Writer Three Republicans want to go to Washington as Georgia's new U.S. senator but only two of them want to come to Columbus for a televised debate. Rep. Mac Collins and businessman Herman Cain have accepted invitations for a Sunday night debate at the RiverCenter for the Performing Arts. Rep. Johnny Isakson has declined. This won't be the first debate held without the presence of the GOP frontrunner. To date, he has passed on five different debates, most...