In a stunning move, veteran Republican Senator Arlen Specter of Pennsylvania switched parties. That leaves Democrats one seat shy of a 60-vote filibuster -resistant majority.

• 老共和党宾夕法尼亚参议员改变党派，这一举动让人大跌眼镜.；这使得民主党以一票之差失去一个需要60票的反对阻挠议案的通过