Here’s our quick weekly catch-up on the presidential campaign and the field of 24 — well, make that 23 — candidates for the Democratic nomination.

Hickenlooper exits and mulls a Senate run

On Tuesday, my colleague Reid J. Epstein reported that former Gov. John Hickenlooper of Colorado was talking to Democrats about ending his presidential bid and entering the race for his state’s Republican-held Senate seat.

Two days later, Mr. Hickenlooper announced his 2020 campaign was over. And he left the door open to a Senate run.

Colorado is a purple battleground state, and flipping the seat currently held by Senator Cory Gardner is all but mandatory if Democrats hope to have any chance of retaking the Senate.