[link|http://en.wikipedia.org/wiki/United_States_House_election%2C_2006_complete_list|2006 House Races].
[link|http://en.wikipedia.org/wiki/U.S._Senate_election%2C_2006|2006 Senate Races].
I don't have the time to go through the ~ 468-469 names.
We hear about critics of the Iraq war who are veterans running for Congress or the Senate because it's more "newsworthy" than when, oh, I don't know, another millionaire decides to buy his own seat. I would suspect that significantly less than half of the candidates running against incumbents are veterans.
Cheers,
Scott.