What's the difference between swing and trend maps ?
Trend is swing relative to the national swing.
Or more explicitly put: Swing compares how a region voted now to how it voted 6 years ago.
Trend compares the swing in a region to the national average swing. (If a region swung 5% away from Chavez, while the Nation as a whole swung 10% away from him, that'd mean the region would be trending towards Chavez)
With trend you have the silliness where Democrat gets 90% in DC in a close election. Next Democrat gets 95% in DC, and wins by 20 points nationwide. Oh noes, DC trended away from the Democrats.
