Mary Anne Marsh: In fierce Democratic presidential debate, 1 winner and 5 losers

Multibillionaire Michael Bloomberg landed in Las Vegas like a highly anticipated show on the Strip. But when he took to the stage with five competitors for the Democratic presidential nomination Wednesday night, their debate immediately became an Ultimate Fighting Championship match.

Sen. Elizabeth Warren, D-Mass., landed the most blows and won the night. Warren would not be ignored or denied.

Warren flattened Bloomberg out of the gate using his own words against the former New York City mayor and he never recovered. As a result, voters got to see the real Warren, who was the front-runner last fall. And they saw the real Bloomberg, not the filtered one seen on paid TV ads and in social media.