U.S. CAPITOL – If you’re online at this hour, you probably know that Sen. Rand Paul has held the floor of the U.S. Senate for more than nine hours. He is filibustering President Obama’s nomination of John Brennan to head the CIA, objecting to the apparent Obama administration policy that it can execute, without trial or charge, U.S. citizens, even when they pose no imminent threat, and even when they are on U.S. soil.

I’ve spent most of tonight in and around the Senate chamber. Here are some things you may not know, if you’re just watching on C-Span: