If you’ve been paying attention to presidential politics, you’ve heard about Herman Cain’s 9-9-9 plan for revamping the federal tax code.

How about 6-6-6?

That was Michele Bachmann’s take on the flaws in the tax plan offered by the former Godfather’s Pizza CEO.

“When you take the 9-9-9 plan and turn it upside down, I think the devil is in the details,” the Minnesota Republican said in Tuesday night’s New Hampshire debate.

It was one of the most flamboyant lines in a debate distinguished by the kitchen table intimacy of a sit-around-in-a-circle format.

While the comment was apparently made in jest, it was also apparent that the Bachmann campaign went into the presidential debate loaded for…. Herman Cain. He topped Bachmann in two polls released earlier Tuesday of GOP voters in her do-or-die state of Iowa.

“Herman Cain's signature ‘9-9-9’ levies a brand new national sales tax and would further weaken the U.S. economy, leaving American taxpayers vulnerable to skyrocketing rates imposed by future Congresses,” the Bachmann campaign said in an e-mail sent out halfway trough the Bloomberg/Washington Post debate.

Significantly, it was Cain, not national front-runner Mitt Romney or Tea Party rival Rick Perry, whom Bachmann campaign attacked first in mid-debate press releases.

(Later, the campaign took aim at Perry for the “well connected cronies” who benefited from his Texas Enterprise Fund, as well as for his record on spending and debt as governor of Texas).

Perhaps that could be a tribute to Cain, who has replaced Bachmann in the media spotlight since her straw poll win in Iowa in August. In the end, one of the three – Cain, Perry or Bachmann – would like to emerge as the “anti-Romney” conservative in the GOP nomination battle.