I had the exact same thing happen--a liberal friend who endlessly stomps on W asked me to stop sending her political emails after only a few. Of course, that didn't stop her from the Bushbashing, until I pointed out her hypocrisy.
I sent my lib sister-in-law some emails about Demo'rat corruption, until she asked me to quit because "they make me nauseous". I eschewed any gloating after November 2!
Oh yeah. I had a professor tell my advisor I was "too political" and had better cool it... and his office door was (and still is) plastered with anti-Bush, pro-Marx spout & drivel.