A small sampling:

Sanders sends Democratic establishment into panic mode

"In 30-plus years of politics, I’ve never seen this level of doom. I’ve never had a day with so many people texting, emailing, calling me with so much doom and gloom,” said Matt Bennett of the center-left group Third Way after Sanders' win in Nevada

In a fascinating turn, just two days before the Iowa caucus, "The Gold Standard in Polling" has decided to nix their results moments before release. Ann Selzer and the Des Moines Register decided at the last minute to cancel their CNN special and toss out the results.

From The Hill: