We know this is history being written.
How each Senator votes will go down in history by their name.
They'd better be sure that how they vote is something they'll be happy to be remembered for in 25 years' time, and in 50 years' time.
Something they'll be happy for their grandchildren and great-grandchildren to learn in school.
I'm sure they'd love to be able to say, "Oh but we didn't know! If only someone had told us!"
The impeachment managers are making sure they do know, and are seen to know...