Purloined Primaries and Confounded Caucuses

I have never voted in Wisconsin primary* in which the results meant anything. I thought this year would be different, but I am disappointed once again.

Now I wonder how much mischief idle Republican voters can make in the remaining Democratic primaries and caucuses. Those contests will make a difference. Even if I thought such trickery to be ethical (which I don't), I would be terrified that my machinations might have horrible, unintended consequences. For instance, if I thought Hillary was the weaker candidate and I voted for her in the primary, and she were elected president, could I look at myself in the mirror? Or would it result in a lot of razor nicks on my already scarred face?

*It may be the case that I have never voted in a Wisconsin presidential primary at all. My memory fails me.