Sen. Joe Lieberman (I-CT), who endorsed Sen. John McCain (R-AZ) for president, will be disqualified as a superdelegate at the Democratic convention "under what is informally known as the Zell Miller rule." In 2004, Miller -- then a Democratic senator from Georgia -- attacked Sen. John Kerry (D-MA) in a speech at the Republican National Convention. The DNC "responded with a rule disqualifying any Democrat who crosses the aisle from being a super delegate."