HE ONLY LEFT THE GOP BECAUSE HE WAS FORCED:

Specter votes against Dem agenda again (J. Taylor Rushing, 04/30/09, The Hill)

Newly minted Democratic Sen. Arlen Specter is already asserting his famous independence, casting his second straight vote against his new party's agenda.

Specter (Pa.) on Thursday voted against a controversial bill that would have rewritten bankruptcy laws — a bill cherished by Majority Whip Dick Durbin (D-Ill.) — just a day after voting against the Democratic-written budget. [...]

Specter has also already announced his opposition to another key Democratic priority: the Employee Free Choice Act, also known as the "card-check" bill.