All depends on who the advertisers are. If they're in accord with the stated aims and purposes of this website, I don't see why they'd try to water down the editorial content of the site.
Now, I don't know if one can cherry pick advertisers like that, but I don't see why you couldn't. As long as you're not contracted with some ad aggregator, you should certainly have a say in who advertises on your site.
Too many twits are jumping on Romney's bandwagon. I'm not certain that we'd be allowed the freedom that we now enjoy.