Debate coach: A shameful Republican debate

By Todd Graham

Updated 0741 GMT (1541 HKT) February 14, 2016

The CBS Republican debate in 2 minutes 02:09

Story highlights

Todd Graham: GOP candidates blew it at debate, with personal attacks, a thin-skinned Trump, and Cruz unable to defend himself
He says rowdy audience made a poor showing, and moderators lost control of their debaters

Todd Graham is director of debate at Southern Illinois University. His teams have won national championships for three years, and he's been recognized twice as the national debate coach of the year. The opinions expressed in this commentary are solely those of the author.

(CNN)The Republican debate in South Carolina Saturday on night was far below what I'd hoped for as a debate coach, so the grades generally reflected that this time. It's like one of those "group projects" where one person in the group is so poor as to bring everyone else down. Sometimes, nobody gets an A.

I'll begin with the best of the lot.

B-

Marco Rubio: Rubio was generally decent (solid in his discussion of child tax-credits, worse on amnesty and immigration and his record in Florida). He had a poor exchange on immigration with Cruz that somehow ended up with Cruz speaking Spanish. It wasn't Rubio's best debate, but since it wasn't the disaster of his last one, where the (now gone) Chris Christie mocked him for repeating himself, people will probably give him too much credit. B minus seems appropriate.