The Miami-Dade Elections office is releasing all of their nifty post-election data, and here's a map showing the geographical divide of the county. Even though Obama could be considered green in two alternative meanings of the word, he is actually represented by the teal. McCain is green. Beige represents a tie (in all but two of those precincts, no one actually voted. In the others two people each showed up and canceled the other out. I'm pretty sure those correlate to islands and such).
With a few notable exceptions, Obama dominated the areas closer to the coast, while McCain dominated our own version of the "Inland Empire". Those big patches of teal even further out west represents all of 1,731 vote (though, they did break handily for Obama).