The congressional Republicans at today's televised health-care "summit" at the White House naturally want to prevent the president from turning it into a PR stunt. This is no easy task. They'll not only have to point out problems with his plan and offer their own ideas, but correct the president when he makes statements that are not true.

The GOP participants appear ready for the first two tasks. In an unusual approach, House and Senate members prepped together the way a candidate preps for a presidential debates—by pulling together debate books and conducting mock sessions. But the third task is the most critical and the most difficult.

President Obama has a habit of making false statements, and getting away with them. At a Republican conference in Baltimore last month, for example, he denied that his budget nearly triples the national debt over 10 years. He got away with it because he didn't face follow-up questions or objections.