If they retire, then they can stay in Washington as lobbyist. If not, and they lose... They are done. Thus, why we see so many senators leaving.
President-Elect Obama Supports Senator in Recruiting Tony Dungy for Government Work--Tony Dungy hasn't even been unemployed for two full days just yet, but he's already coveted by the government. Evan Bayh, a Senator from Indiana, would like to bring Dungy aboard to promote responsible fatherhood nationwide.
Maybe Tony Dungy is going to run for Bayh's seat.