Tuesday's message to incumbents

By Ben Pershing It's the morning after the morning after, and already the conventional wisdom about Tuesday's elections has begun to shift. The initial reaction -- Republicans had a great day -- has shifted to this: Republicans had a great day, but both parties should watch their backs. After much of Wednesday's coverage focused on the GOP's banner wins, Thursday's hones in on a broad-based undercurrent of anger and frustration in the electorate that could hurt incumbents of all stripes next fall. Associated Press ledes: "Voters' memo to politicians: We're angry and fearful, mostly about jobs and the economy. We want tangible solutions, not partisan bickering or intraparty spats. And we'll vote either party out of office if we don't think you're listening." E.J. Dionne picks up that theme, saying "the disaffection in Virginia and New Jersey -- and the unexpected narrowness of New York Mayor Mike Bloomberg's reelection margin,