Grover Norquist tangled over taxes with Huffington Post reporters Ryan Grim and Zach Carter on HuffPost Live Thursday.
Norquist dismissed those who believe in government spending to stimulate the economy, comparing the belief to Scientology.
"This is called Keynesianism, and they've got nice churches, and they truly believe this, they're like Scientologists with their little black boxes," he said.
"The general public... understands that when the government builds a bridge, or the government builds a school, those are jobs, and that's economic activity that they're creating," Grim countered. "So I think that he's lost that argument."