Actually, I have a prediction here--
and that is we are now starting to see the shape of the forthcoming 'national debate' that will come out of this incident in our politics.
What we will be treated to now is a vigorous debate on the mental health 'restrictions' that should be implemented for common-sense gun control.
There are plenty of preceding comments here identifying the political nature of how the Democrats will use this tragedy. Generally, I think those observations are correct--the more restrictions / more laws game for guns won't play anymore, and Democrats can probably win in '08 if they don't shoot themselves in the foot (otherwise known as playing to the center.)
It's a perfect debate for Republicans / conservatives, too--because, after seven years of neocon-big governmentism from GWB & group, they can play to the individual liberties game. There's an awful lot of Republicans who are afraid of the impact of their brand of conservatism on the public perception over the last eight-ten years, and they need a way to play a hot topic to differentiate themselves as 'conservatives' again.
In this version, the Dems get to offer funds (source unknown) to the States, etc., to be able to update their MH databases and get it over into NICS. The Repubs get to thunder about privacy and cost, and sound much more conservative than GWB and crowd. In the end, after polling shows the way, a bill is passed to give more funds to the States for database updating, and everyone can take credit.
It's a win-win for both sides--activate the bases, sway the middle, and get money to stay in office. Doesn't matter who wins.