But there might be a silver lining for the long-time Pennsylvania lawmaker: The MoveOn poll found that 90 percent of its members said they would support Specter if he chooses to align more closely with the president’s agenda.

“When it comes to 2010, our members will be looking at Senator Specter’s votes on the issues, not at his party label,” Justin Ruben, the executive director of MoveOn said in a statement. “They’ll look at whether he stands with the people of Pennsylvania to rein in Wall Street, invest in a new energy economy, take on the health insurance companies and protect the rights of working people. Our members are encouraging Senator Specter to stand up to the lobbyists and special interests, and they’ll be watching to see if he does.”