Were any Republicans present during Cory Booker's marathon?

[Jeebo]

I watched two or three hours of Cory Booker's speech (would it be accurate to call it a filibuster?), Monday night and Tuesday afternoon, and I kept noticing, none of the senators who were asking him questions were Republicans, and none of those present around the periphery of the camera shots were Republicans. Were any Republicans even there? Did they all just clear out of the Senate chamber while he was speaking and try to ignore him?

-- Ron