Ahead of CNN's Western Republican Presidential Debate, Erin Burnett talked to Grover Norquist, president of Americans for Tax Reform. He argues Herman Cain's "9-9-9" plan, saying it creates "three little tapeworms" that could grow into big tapeworms threatening to increase the tax burden on Americans.

In the interview, Norquist also clarifies whether closing tax loopholes fits in with his group's tax reform pledge.

The Republican presidential candidates have gathered in Las Vegas for tonight's CNN debate, and regular OutFront contributor Gloria Borger filed this Debate 101 report–she says to the candidates, these debates are job interviews, and you're doing the hiring.