[CptnObvious]

4) I can see Democrats eventually telling their deranged base that they need to give Trump his wall money in order to reopen the government and begin impeachment proceedings, etc.

A shutdown doesn't effect the House or the Senate.

The only leverage is the Senate and the veto.

[MountainWalker]

Yeah, I know that, but it’d be a convenient excuse to tell the rubes. If shutdowns affected Congress the government could never reopen.