You don't know how the Senate works, do you?
Explain
Basically, any member who votes "no" is allowed to call for a reconsideration at a later day. A member who votes "yes" is not. So, routinely, if the nomination goes down, the majority leader at the last moment switches his vote to "no", to be allowed to request a revote if he manages to get a majority in favor.
But unless someone has changed sides, is there anything to be gained by a revote? (Granted the GOP seems to think so with their repeated votes to defund Obamacare in the House, but I thought Reid was saner.) And if someone does change sides, couldn't they be the one to request a revote?
The only way Reid's no vote makes sense is if plans to suddenly bring up the revote while several opponents are out of Washington, letting Adegbile be confirmed by something like a 48-46 vote. Adegbile ain't worth the firestorm a stunt like that would cause.