Iraq war veterans brought their military credibility to the podium on Wednesday and endorsed Sen. Barack Obama as the best candidate to lead the military and help veterans. Seeking to bolster Obama's credentials on security issues, Obama was formally nominated at the Democratic convention by Michael Wilson, 33, of Melbourne, Fla., an Air Force medic who served in Iraq. Wilson, a Republican, said Obama has wisdom and courage "to talk to our enemies and consult with our allies."