In his new column, “Will Moderates Defeat Moderation?”, E.J. Dionne explains why a centrist third party would not lead to centrist policies:

The deficit that should most worry us is a deficit of reasonableness. The problems the United States confronts are large but not insoluble. Yet sensible solutions that are broadly popular can’t be enacted.

Why? Because an ideological bloc that sees every crisis as an opportunity to reduce the size of government holds enough power in Congress to stop us from doing what needs to be done.

Some of my middle-of-the-road columnist friends keep ascribing our difficulties to structural problems in our politics. A few call for a centrist third party. But the problem we face isn’t about structures or the party system. It’s about ideology — specifically a right-wing ideology that has temporarily taken over the Republican Party and needs to be defeated before we can have a reasonable debate between moderate conservatives and moderate progressives about our country’s future.

A centrist third party would divide the opposition to the right wing and ease its triumph. That’s the last thing authentic moderates should want.