As I promised last night, here are a couple of purely election- and/or electoral strategy-oriented websites.
Fivethirtyeight.com — This guy is just in a league of his own, on predicting races and other things. He called the 2008 election in practically every detail and became famous in politics practically overnight. He started off as a sports statistician, so — unlike 99% of political writers — understands how numbers work.
Larry Sabato’s Crystal Ball — Same sort of thing, from an academic elections specialist. Good general info on what kinds of big factors/trends swing elections one way or the other.
Thedemocraticstrategist.org — Top-notch commentary and daily lay-of-the-land blog posts and advice to Democrats. Very centrist, although partisan.
Pollster.com — Focuses on latest political poll results, less so on predicting future elections. For hard-core polling junkies, mainly.