Interesting!

2008 Presidential Odds Sponsored by BetUS
Barack Obama: -600
John McCain: +350

2008 Presidential Odds Sponsored by LooseLines
Barack Obama: -750
John McCain: +600
Other Party: +4000

2008 Presidential Odds Sponsored by SBG Global
Barack Obama: -750
John McCain: +475

2008 Presidential Odds Sponsored by Sportsbook.com
Barack Obama: -700
John McCain: +400

2008 Presidential Odds Sponsored by SportsBetting.com
Barack Obama: -700
John McCain: +400

2008 Presidential Odds Sponsored by BodogLife
Barack Obama: -600
John McCain: +400

SOURCE:
http://www.1800-sports.com/president...ing-odds.shtml