"I don't hold it against him, " Walker said.

NPR: South Carolina Voters React to Skirmish over Race

"If a business is failing, you don't raise the prices on your customers, " Mr. Walker scoffs.

WSJ: Stephen Moore: The Most Important Non-Presidential Election of the Decade

No, a walker is someone who takes Senate wives to things that their husbands don't want to go to, okay?

NPR: 'Juno' and 'Atonement' Top Weekend Movie List

"You don't have to restore brain cells to restore sleep, " said Dr Walker who described their aim as "jump-starting" the system.

BBC: Boosting sleep 'may slow memory rot'