[9YearLurker]

All I can figure is:

1) blackmail
2) money
3) sleeper Democrats
4) idiots just wanting to be loved

I suspect the average Congresscritter/senator has some combination of a multiple of these factors in play.

[USS Johnston]

All I can figure is:

1) blackmail...4) idiots just wanting to be loved

Yep.

And 5): "It'd be a shame if anything ever happened to...."