Senator David Vitter (R - Louisiana) is under investigation for violations of security regulations. Vitter tried to bully his way on board an aircraft after the security door had already been closed. Vitter opened the closed security door and triggered an alarm, then fled before the airport police arrived. Vitter is perhaps best known for his admitted use of prostitutes.
Vitter is up for re-election in 2010 and will probably lose, providing Democrats with their 60th or 61st (or possibly even 62nd) seat in the U.S Senate.