One Republican loser who will definitely be back in some form or another is Anne Northup. I would be surprised if Melissa Hart doesn't return also.
On a comment here: Patsy Madrid was a terrible candidate. The Dems in NM will try someone else again (and probably fail) in trying to get rid of Heather Wilson.
But surely Northup is tainted by the stigma of defeat? Don't you have a theory she wants to challenge Ernie Fletcher in the 2007 GOP gubernatorial primary?
Melissa Hart will probably run against Altmire again in 2008. Her loss was a blow to the Republicans who saw her as a future Governor or Senate candidate.