@YouTube is there any way to block a specific ad from showing before I watch a video? I sat down to watch @GlamandGore ‘s new video and there was a pro-Trump ad that I’d rather not see ever again. 

With elections in progress, you may see some features on YouTube that provide more info about registration, candidates, and the election. You can always choose to block political ads from appearing on your channel and videos. Here’s how: https://goo.gl/BzvbKq . Hope this helps.