The veteran Senator holds presser to say he's switching parties, acknowledges he would have faced a tough re-election battle as a Republican.
Though he warns Democrats: "I will not be that automatic 60th vote..." Click above to watch.
MUST-READ STATEMENT: "I now find my political philosophy more in line with Democrats than Republicans." Read it here.
Earlier: Specter sits on the Democratic side of the dais before his official announcement. Watch him speak outside his office here.
