Mueller clearly stated at the opening of his House Judiciary testimony that he never even considered the question of collusion within his investigation. He was trying to determine whether the evidence rose to the level of a conspiracy between the Trump campaign and Russia that could merit criminal charges.
Mueller's opening statement: “The investigation did not establish that members of the Trump campaign conspired with the Russian government in its election interference activities,” Mueller said. But: “We did not address ‘collusion,’ which is not a legal term. Rather, we focused on whether the evidence was sufficient to charge any member of the campaign with taking part in a criminal conspiracy. It was not.” Suffice it to say, the evidence uncovered by Mueller's team demonstrated plenty of contacts that could be described as "collusion" but there was no criminal violation, merely a moral/ethical one.
I'll need to find the right quote from Wednesday, but I believe there was an exchange between Mueller and a member of the Judiciary Cmte. where Mueller pretty much said they decided not to charge the President on day 1 of the investigation--i.e. regardless of whatever evidence was uncovered (even if they did prove conspiracy.)
And I'm quite sure the reason conspiracy couldn't be proven was the amount of obstruction that went on. It sickens me that so many people don't care about this country, just about their 'side'. I want the right wing to just think whether in their minds if it was proven or not if all of this 'evidence' was against Obama. Would you be making these foolish defenses? Hell NO!