I count five, stated in various ways (listed under video).
1. The Democrats still want to blame the Bush administration for the economy.
2. The Democrats want to dismantle the CIA.
3. Nancy Pelosi is looking for political cover.
4. It’s not unusual for president and vice-president to be involved.
5. The CIA is in the secrecy business and Congress wants to know everything.
(And one dodge: “I don’t have enough information.”)
Via Think Progress.