This is pretty big news. Reports out of Washington indicate Pennsylvania Senator Arlen Specter will switch parties moving from a Republican to a Democrat. The announcement is expected today or tomorrow.

Republicans in Pennsylvania have been planning to mount a primary challenge against Specter because the senator is viewed by party operatives as too liberal. Well, looks like they got their wish to get rid of Specter. Too bad the result will almost certainly give Democrats a 60 vote majority in the Senate (assuming Al Franken officially wins in Minnesota, which looks very likely).

More as the story develops.

Politics Arlen Specter to Change Parties?