But the ads are just generated by Google, as opposed to the companies and organisations directly! What determines which adverts each person sees is their location as well as any cookies/search history of the computer. A few months ago, I got a lot of adverts concerning the Finnish elections for the European Parliament: probably because I'm in Europe and had recently viewed some politically oriented sites.
Would it be fair to say that you've been visiting some US-election based websites, Freaky? As that would explain why you've been seeing a preponderence of Mitt Romney adverts.
Having said that, Mitt Romney's campaign is not directly funding PC; Google is, but is showing you a Mitt Romney advert because of the specifications I mentioned earlier.
I could be compleeeeeeeetely wrong on this, but I think what I said is true. Steve!? Help a brother out, here!