Here’s our quick weekly catch-up on the presidential campaign and the rapidly shrinking Democratic field. That’s right — there are now only 21 candidates for the nomination.

A series of shake-ups

Jay Inslee drops out

Late Wednesday night, Gov. Jay Inslee of Washington went on MSNBC and said that he would withdraw from the presidential race.

Mr. Inslee had devoted his campaign to raising the alarm about climate change and pulled out of the primary just hours after he unveiled the sixth and final piece of a 200-page plan to address the issue.

Though Mr. Inslee had attracted more than 130,000 donors, he had failed to gain traction in the polls and was unlikely to qualify for the next Democratic debate.