It is clear the Senate will not vote the 67% to convict Trump - foregone conclusion. Fascist DPST's are pushing this proceeding - wanting witnesses and more testimony not under precedent in the forwarded Articles of Impeachment - to get a denial vote in the Senate.
They can then claim "Unfair" at the top of the lungs and try to use that hypocritical characterization of the Senate proceedings to defeat Trump in 2020 election.
The other matter is they will pressure the republican senators on the borderline to vote to convict - romney, Collins. others - to get a 51% vote to convict - and can then spout to the public that the Senate majority voted to Convict Trump in election propaganda.
It is all about the 2020 election and preparing propaganda for the Fascist DPST's.