198 I don't choose my ads for Blogspot

I'm using Blogger el-cheapo. So I have a small discreet ad in blue at the top of my web log. Nothing flashy. For free, I can live with it. But in 197 or so blogs, I've probably mentioned Howard Dean once. So whose name is flashing at the top of my Collecting My Thoughts, why Mr. Dean, of course (at least as I'm typing this).

How is that paid for--does a crawler go out and grab anyone who has ever mentioned him? And what if someone talks about Dean Howard, or Dean Martin, or Dean's Milk? Would that flag an ad? Or is it anything political?

Google has asked for feedback, so here's what I've written:

Dear Friendly People at Google:

You seem to be doing an OK job on ads for my http://uglyacronym.blogspot.com, and have included Lutheran and hymnal ads which is about right since I am a Lutheran and blogging about religious topics.

But on my other one, http://collectingmythoughts.blogspot.com, which is about anything and everything, recipes, genealogy, memories, etc., I've probably mentioned Howard Dean once in 196 posts, politics in 10 or 15, but his name appears in the blogspot ad. What's up with that?