I could rant a long time on yesterday's John Doe document dump that shows Governor Walker at the center of a "criminal scheme." But I'll save that for another time. Instead, I'll give you a look at the great chart the Washington Post put together based on those documents, which shows how this scheme worked.
And that's what this case has been about from Day 1- tax evasion, money laundering, and evading campaign finance and disclosure laws. And none of those items are allowed under Citizens United or McCutcheon . These fake Koch/ Bradley groups can do their OWN ads, but they can't work with Gov Walker to send funds to each other, because that's considered a campaign contribution to a candidate, and is subject to campaign finance limits and disclosure.
Anyone who tries to deflect off of this point is being dishonest, and it's why this case will be back on once the Court of Appeals overrules at least part of Judge Randa's crooked, biased decision.
As for the rest, read the account from the guy who's been on this case from the start- Capper at Cognitive Dissidence. And remember this clip from a movie about another group of GOP scumbags who were claiming a "partisan witch hunt" 40 years ago.