Better question did you presume President Donald J. Trump innocent?
It's not a better question, but I'll answer it anyway.
No.
I also didn't presume him guilty.
From what we knew at the time; Russians had approached his campaign manager, son and son-in-law to trade dirt on Hillary, I presumed Donald Trump knew about it, but there was no quid pro quo and little basis for collusion. Don Jr. lied about it and then recanted, so we knew the charges weren't unfounded -- just thin at the moment. Campaign dirt isn't that big of a deal, by itself. Trump had also skated a fine line on obstruction of justice in broad daylight, so that could have gone either way under further investigation.
The reason the Mueller investigation made me lean towards guilt was how long it was taking and how many Trump insiders were flipping. Again, it was no secret that Donald Trump was fiscally compromised since the late 90s, and almost entirely reliant on Russian money starting around 2003 --- Don Jr. admits that on record. A lot of Trump insiders were caught lying, something innocent people don't do. Word was that the head of Trump Enterprises finances was cooperating, that the Mueller team might be demanding Trump's income taxes, and that the investigation was leading places outside the Russian purview (not unlike the Starr Report veering from land fraud to intern diddling.) Everything was taking longer because Mueller was being meticulous. That didn't point to exoneration at the time.
Still doesn't. We haven't seen the report. The only thing we can presume is that Mueller couldn't issue any more than the 34 indictments and 7 convictions already handed down, although apparently he did share his findings with the Southern District of New York, the more appropriate venue for future charges.
Now you go.