This post was updated at 8:30 a.m. ET to include debate metrics from Twitter
Like no doubt millions of Americans, Bernie Sanders tuned in to the Republican debate on CNN. But the Vermont independent who is running for the Democratic nomination for president didn't stop there.
The septuagenarian senator live tweeted the debate, with help from his 24-year-old digital director. That is, until just shy of 10:30 p.m., when he called it quits.