Does Google embargo right-leaning blogs?

As noted yesterday, Google's secret algorithm (does that have anything to do with defending against attacks on Al Gore?) has declared my site a spam site and I can only post now if I type in a bunch of distorted letters which are so hard to read that often two or even attempts are necessary before I get through. Google won't disclose its criteria for deciding what's spam but a reader has suggested that the company seems to label right-leaning blogs "spam" more frequently than it does other sites. True? Is the button "report offensive material" an invitation for angry readers to shut down blogs they don't like? I really don't know, so I'm going to forward this post to some better-read blogs in the hope that the issue can be clarified.