I hope he does it, it will make the Connecticut Senate race very interesting:

Former independent presidential candidate Ralph Nader is mulling a run against Sen. Chris Dodd (D) in Connecticut, according to a report.
Nader, the 2000 and 2004 Green Party candidate for president, is “absorbing” the prospects of waging an independent candidacy against Dodd in 2010

Would love to see a debate between the three candidates. Maybe Dodd can explain his Countrywide loan agreement.