We run probably the most popular global advertising network to pay the overheads of operating the site. I'm not super happy about them running political ads, whatever direction but ultimately as far as I know that ad network will run ads for either party, there's no bias involved. We don't choose the ads that run here and they're highly personalised to individual user's geography and things you've searched for or visited.
While I understand the benefits of running an ad blocker and I'm not for or against it - if everyone did it would make it a lot tougher to justify the ongoing costs (forum software licencing, hosting, time) of keeping things going.
AFAIK our ad provider will let you click on an ad and tell them you didn't like it and not to show ads like that in the future (since this provider's ads are really common, that's probably a useful tip) - so if you're seeing something you don't want to - I'd suggest doing that and they'll stop showing it to you!