The Scariest Number for Democrats

Looking ahead to the fall, what's the scariest metric for Democrats to watch?

I'd say that it's the generic ballot question among those voters who express a high level of enthusiasm about the fall elections. And in the latest NBC News/Wall Street Journal poll, the gap between Republicans and Democrats in 13 points.

The best number for Democrats these days: a not-insignificant rise in support for health care reform, engendered by the rallying of Democrats and Democratic-leaning independents to the cause.  If it passes, look for the number to rise even higher.