If it is found that our election was manipulated by the Russians, I think we should get rid of everyone elected in 2016 and have a new elections. It would be of no use to simply impeach Trump and allow Pence and the rest of the newly elected republicans stay in office. I say, stop and resend all bills passed as well as executive orders since the elections... and start anew with a clean election.
Before you can prove obstruction of justice you have to prove a crime took place and justice was obstructed in investigating it. To date no such crime has been proven or even contemplated. No crime, no obstruction! A pretty simple thing to understand, don't you think?