In this April 29, 2009 file photo, Veteran GOP Senator Arlen Specter of Pennsylvania discusses his conversion to the Democratic Party at the White House with President Barack Obama, left, in Washington. The Federal Election Commission said Thursday a conservative political group can use Republican-turned-Democrat Arlen Specter's campaign donor list to inform givers of the senator's promise to return money to those upset by his switch. AP Photo logo AP Photo 3 months ago

In this April 29, 2009 file photo, Veteran GOP Senator Arlen Specter of Pennsylvania discusses his conversion to the Democratic Party at the White House with President Barack Obama, left, in Washington. The Federal Election Commission said Thursday a conservative political group can use Republican-turned-Democrat Arlen Specter's campaign donor list to inform givers of the senator's promise to return money to those upset by his switch.