Lets talk about the primaries first.I feel that the Democrat party's electoral process was stacked to make sure Clinton got the nomination instead of Sanders. I think in a straight first past the post electoral system without SuperPACs Sanders would have had a much better chance of clinching the nomination.
SuperPACs spend money on advertising on behalf of candidates and issues. I don't see how they relate to the first past the post electoral system here. Did you mean Super Delegates?
Hillary Clinton won nearly 57% of the primary vote and around 55% of the pledged delegates. The difference between the two results is Sanders won nearly all of the much lower turnout caucus states.
There may be a slight bit of truth that the Democratic Primary Presidential debates being scheduled to minimize viewers may have had an impact, but the last of these debates had, if I recall correctly, something like just six million total viewers. So tricky scheduling or not, a viewership that low suggests to me most Democrats had already made up their minds.
If you meant, super delegates, and not SuperPACs, as you can see by the numbers, counting only the pledged delegates Hillary Clinton would have won. In no scenario would Bernie Sanders have won the Democratic Primary.
The problem, which is a deliberate distortion of the Democratic Convention results, which some innumerate (math illiterate) people have fallen for, is that the Hillary Haters take Hillary Clinton's pledged delegate total, and then they take the total number of delegates, both the pledged delegates and the Super Delegates, and they say "see without the Superdelegates, Hillary Clinton won a minority of (total) delegates.
The old British television program "Yes, Minister" mocked something similar to this when Minister James Hacker found out about a fully staffed 500 bed hospital with no patients. Unfortunately I can't find the transcript of the episode, but Hacker's Permanent Secretary (Deputy, i.e the real boss) at one point says something like "It doesn't matter that there are no patients there, the work of the hospital has to go on." Hacker replies "But why? If they weren't there, they wouldn't have to be there."
So, it's the same idea. If the Superdelegates weren't there, then the total number of delegates would be just the number of pledged delegates and Hillary Clinton won a majority of them. Or, the total number of pledged delegates could have been increased to encompass the number of Superdelegates so as to have the same total number of delegates as were at the convention, and Hillary Clinton would still have won the majority of those delegates.
Under no scenario would Hillary Clinton not have won the nominating convention.
Of course, if you aren't referring to the Superdelegates but were referring to SuperPACs, I apologize for going on, but I don't know what you mean then.