Good point from The Washington Post:
Unlike in most elections, when both parties defend several seats, Democrats are favored to win every seat they now occupy and are spending money to defend only a few. As a result, Democrats are not as vulnerable to the GOP's campaign finance advantage in the final weeks as they have been in past campaigns.
Democrats are playing all offense, and just about no defense. Meanwhile, Republicans are defending all over the board, and you can bet older, more powerful Congressmen are demanding money their minimal vulnerability wouldn't justify in order to ensure they aren't caught unaware by a political wave. And that's not even getting into how much NRCC Chair Tom Reynolds is likely funneling to himself now that Foley has made him vulnerable.
The GOP hopes to refocus the debate on national security now that North Korea has detonated a bomb. That'll be a tough case to make, however, as the explosion went off while George W. Bush and the GOP were at the helm. New polling shows that congressional Democrats, for the first time ever, are favored to handle terrorism, and it's unlikely that Bush's failure to contain or improve a single member of the "Axis of Evil" will change those numbers. Meanwhile, Democrats would be wise to study up on Eric Alterman's helpful recounting of Bush's missteps and blunders towards North Korea.
Update: Remember before the 2004 election, when Democrats spend inordinate amounts of time telling each other that all the polls were oversampling Republicans, and undercounting minorities, and generally getting everything wrong in a way that favored the GOP? Well, no one tell the right how that worked out for us...