Contrasting styles in Republican Senate race Mainstays of the debate circuit, the Republican U.S. Senate candidates are staunch conservatives. Larry Peterson 912.652.0367 larry.peterson@savannahnow.com Mac Collins and Herman Cain have become the Republican Odd Couple of the U.S. Senate race. U.S. Rep. Johnny Isakson, also seeking the GOP nomination to the seat Democrat Zell Miller is giving up, has skipped most of the candidates' debates held so far. So at debate after debate, Collins, a middle Georgia congressman, and Cain, a McDonough businessman, have been the fixtures, usually without Isakson. So it was Monday, when 200 people showed up to hear...