"But to answer your question, I think Cain lives in the Atlanta suburbs, and the only safe seats he could run for will have Republican incumbents who won't be going anywhere."
Herman lives in Henry county, which is in the southeastern part of greater Atlanta metro. Henry is split between at least 2 of Georgia's congressional districts - the 13th and the 8th. He lives in the part that is in the 8th, which is currently represented by Mac Collins. That district will probably be represented by Lynn Westmoreland 2 years from now. The 13th is represented now by David Scott, an African American Democrat who has no serious opposition this election cycle. Scott is a moderate, not nearly as liberal as John Lewis or whoever wins the 4th CD - either Cynthia McKinney or Liane Levitan. However, it would make more sense (to me, at least) for Herman to run in the 13th in 2 years if he wanted to try for a house seat.
Having said all that, I think it is unlikely that he would run for the house even if he falls short in this year's senate race - and I still hope he prevails tomorrow. Many people here believe that he has a good chance to win a runoff. However, he has to make it into a runoff first. Tomorrow will be exciting. I will be at Herman's party tomorrow night - let's hope it is a celebration.
"That district will probably be represented by Lynn Westmoreland 2 years from now."
Westmoreland is the frontrunner in the Republican primary now; that district will almost certainly go Republican this cycle. The other possibility is Dylan Glenn, a very attractive African American Republican.