It's pretty enlightening, because I wasn't 100% confident in all of my research when I did this.
You're absolutely right about the United States with respect to the native inhabitants. Actually, I was thinking about putting Mexico or Spain as examples where millions of people speak different languages from birth.
Do you have any links/sources about your Russian information? That was one of the countries which I was less certain about in my statements.
Hmm...you may be right. On the other hand, the statistics I've seen out there - e.g. you own example about Rush Limbaugh's main audience - don't tend to support the hypothesis that the most elderly are less conservative.