The LA Times explains today why it’s risky to be overly optimistic about Democratic chances in congressional races this year.

On many measures, Bush and the GOP are facing at least as much dissatisfaction as Democrats and President Clinton did just before the 1994 midterm landslide that swept Republicans into control of the House and Senate.

But today’s wave of dissatisfaction is crashing into a political structure that is much more stable than in 1994. It now is tougher to beat House incumbents or to win Senate seats in states that usually back the other party in presidential elections.