HALPERIN'S TAKE: Unanswered Questions Following Specter's Switch

1. What other Republican Senators were courted?

2. How will this impact the votes of Sens. Snowe and Collins?

3. What will Specter's approval rating be in Pennsylvania in the first public poll?

4. How much private polling did Specter do before deciding?

5. How much money will Obama raise for Specter?

6. How much money will conservative groups spend to try to beat him?

7. What Republican Senator will be the point person on the first Obama Supreme Court nominee?

8. Who will run in the Republican and Democratic Senate primaries in Pennsylvania?