Currently the front runner is Peter Roskam, IL State Senator from Wheaton, IL. Roskam, who served as Hyde's staff worker and as a legal aide to Tom Delay, is up and running to solidify the GOP base of the Il-06. Two weeks ago, he was at my church, Wheaton Bible Church, talking about the need for more Christians to participate in elections.
All three candidates are conservatives, with Roskam being the most conservative and Pankau being the least conservative. However, the differences are not vast and all three are pro-life.