Okay, I've been doing my homework and I found a better map and poll. (Actually, I think someone reminded me of this one a couple of weeks ago and I forgot to bookmark it. I have remedied that.)
How about this?
And then there was this on USA Today's website. I liked it for the 48 years of comparison it provided. Check it out, particularly the years 1972 and 1984. And may I just say, I'm proud the District has remained consistent in its voting for the last 48 years! I can guarantee we'll be blue again this fall.