He’s already been impeached. Why would a second impeachment make a difference? What am I missing here?
Impeachment is a Badge of Honor, now.
They think they’ll get a conviction from the Senate this time.
History books will say "really really bad, impeached twice." It is historic precedent, that's for sure.
On paper, a conviction can carry a ban from (federal) office. I think this will encourage more than a few senators to vote to convict. Not to remove, but to prevent Trump from taking office ever again. This is a fantastic way to take out a political competitor and one who is not keen to run the scheme under the accepted protocols.