As far as Obstruction of Congress...I think you need an underlying crime to obstruct against.
Obstruction of congress is an absolute non starter, unless they have been to court to try to enforce a subpoena there's nothing there. It gets dismissed out of hand. The Republicans have an opportunity to really demonstrate how corrupt the Democrats are by putting the "whistleblower" on the stand and then the Inspector General of the Intelligence community.
“Abuse of power” = policy we don’t like.
...and considering we have three “co-equal” branches of government, I have no idea of what “Obstruction of Congress” even means.
If this is what all this has boiled down to....it’s beyond pathetic.