As Bernie Sanders's momentum builds, down-ballot Democrats move to distance themselves  —  Former astronaut Mark Kelly, the Democratic Party's hope for flipping a U.S. Senate seat in Arizona, tried to do no harm this month when he was asked about Sen. Bernie Sanders.

Bloomberg needs to take down Sanders — immediately  —  Joe Lockhart was White House press secretary from 1998-2000 in President Bill Clinton's administration.  He co-hosts the podcast “Words Matter.”  The opinions expressed in this commentary are his own.  View more opinion at CNN.

CBS News poll: In South Carolina, Biden's lead narrows, with Sanders and Steyer on his heels  —  The contest in South Carolina looks very different heading into its final week than it did last fall.  Joe Biden (28%) has only a single-digit lead with Bernie Sanders (23%) now right behind him.

Buttigieg's campaign alleges numerous errors in caucus vote-counting  —  Former South Bend Mayor Pete Buttigieg's campaign, in a letter sent to the Nevada State Democratic Party just before midnight on Sunday, is alleging numerous errors in how early vote totals were folded into the Caucus Day process.

Stand up to Bernie or You - and We - All Lose  —  Memo to Vice President Biden; Mayor Bloomberg; Mayor Buttigieg; Senator Klobuchar; and Senator Warren  —  At the Las Vegas debate, each of you took aim at one another, often to withering effect.  But with few exceptions, you declined to really challenge Senator Sanders.

Bernie Sanders just won the Nevada caucuses  —  Sen. Bernie Sanders campaigns in Las Vegas on February 21, 2020.  Patrick Semansky/AP  —  Sanders is on a winning streak; he has now won two early states in a row.  —  Bernie Sanders is on a roll.  —  The independent senator from Vermont cruised …