If the unions are donating as a single organization, yes, limit that. If they are a group of like minded individuals all individually donating, eff that, it's not even in the same universe as one individual throwing huge cash.
As for the individual politician, that person is running for a job. It isn't a free speech issue.
You are going out of your way to shill for something that is going to negatively effect you as much any anyone else here unless you are independently wealthy in a big way. It's not surprising, but it's ridiculous. Your team loves it, though, so you do, right?
Also, Corporations should never have gotten status as a legal individual, but since they do, they should be held to the same contribution laws as any other legal individual.
Shills like KSU have been touting how screwed up our country is going to be from 8yrs of Obama. This move has more potential to screw it up than anything Obama has done or not done.