"And it'd be just like a democrat to use it against you. "
Could be. Messing around with political stuff during work hours is often frowned upon by employers. And rightly so, IMO.
I'm lucky. I work for myself. Haven't drawn a paycheck since 1974. If I worked for someone else, though, I think I'd avoid this kind of "practical" joke.
I know what you mean about not drawing a paycheck when you're self employed. I used to tell my employees that I was going to quit and get a "real job with a real paycheck." LOL