An NBC/Survey Monkey poll shows that extreme social conservative Rick Santorum's support among Republicans declined from a solid 1% to a less-enthusiastic 0% after his performance in last Thursday's presidential candidate debate on Fox News.

Meanwhile, Chris Christie, New Jersey's bullying, pettily vindictive governor, saw his rating drop by two thirds, from 3% to 1%.

On Friday, the Santorum, a former US senator, said he'd vote for Donald Trump over Hillary Clinton.