to screen our candidates much better, so we don't end up with DINO's...............

All the rhetoric the candidates throw around pre-election is usually pure crap, intended only to get votes, and often lies.
You need to study their past history to see where they really stand on issues.

It is an old game. A person runs as a Dem, gets elected because all of the Republican Voters realize he/she is truly a Republican underneath all his/her Dem rhetoric he/she says to get elected. He/she has a D under their name, so all the Dems vote for him/her and the Repubs do the same knowing he will shift to his/her true self once elected.

It happens all the time, Manchin and Sinema are just the most egregious.......