Second, I don't think America is a "homogeneous mass that behaves that way" and neither did I say that. I said that this (getting to hear long-winded rants about political views, religion, social issues, etc.) occurs constantly when I'm in the US. You've confused my statement of anecdotal evidence as a statement of all encompassing truth. It isn't. I don't believe the majority of Americans are like this. I just think (note that word: think, not know, it's my opinion) you have a significant portion of people that are like this, are quite vocal about it, and aren't overly tolerant of differing opinions.
Third, I'm not confused and no simultaneously differing viewpoints are rolling around in my brain either. I didn't state my own opinions on the matter of Obama, capitalism, universal health care (bet you can guess where I stand on that one though), I merely stated MY experiences with the opinions of Americans I had ran into while traveling. Yes, you relected Obama. Cheers. 48.97% of people that voted didn't vote for Obama. Maybe the people I'm referring to are a subset of them, no?