The Pennsylvania senator has been stripped of his seniority, at least until 2011, and he hasn't exactly voted in lock step with Democrats.
The Senate nears a vote on a bill to help ease the foreclosure crisis, as banking and real estate lobbies successfully resist efforts to let courts adjust terms of mortgages.
On Sunday talk shows, he says the 'big tent' party of Reagan and the late Jack Kemp has been replaced by rigid conservatism.
Twelve Democratic senators joined a united GOP on Thursday to prevent bankruptcy judges from being allowed to rewrite mortgage terms for homeowners facing foreclosure.
But the court's balance of power may not change much, as Justice Souter, a conservative choice, consistently voted liberal.