Explain this. It's pretty modern wouldn't you say?
Somebody made a button. Why did you think that was a difficult question to answer, or that it matters in any way? Anyone can make a button. The DNC didn't make the buttons, the Clinton campaign didn't make the buttons, so it has nothing to do with Democrats.
According to your 'tard logic, if I make a button that says "puppy molesters for Trump" and show a picture of it, it proves that puppy molestors support Trump, and that Trump supports puppy molesters.