They are acting in their own interest, be that being re-elected, or keeping committee assignments, or whatever.
If anything, voters in their respective home districts should make it crystal clear to both Sinema and Manchin exactly what ‘acting in their own interests’, on the hierarchy of self interests, entails.
I am sorry, but there is no evidence to support that.
There is no meter you can attach to them to determine why they do what they do.
They have both stated why they are doing it. Whether you believe it or not, unless you can produce anything to the contrary you are only speculating.
Cynicism in politics is pretty common.
I see that at work here.
Hard to tell.
For now, I am willing to give them the benefit of the doubt.