Far-left Late Show host Stephen Colbert has established himself as the go-to spot for Democrats announcing their 2020 run. The man who, in theory, should be an equal opportunity humorist, is openly embracing his partisan stripes in another way: Colbert on Wednesday lashed out at potential third party candidate Howard Schultz, mocking him as a “beige envelope.”

Snarling at the ex-Starbucks CEO for criticizing Elizabeth Warren and Kamala Harris’s very liberal policies, Colbert complained, “Centrist independent? What do you think he means by that? Because I can't tell because he won't say what he would do as president, other than stop us from taxing billionaires.”

Democrats are very worried that a Scultz bid will split the liberal vote and re-elect Trump. Journalists in the media have been quick to parrot this fear. Talking to the hosts of the Showtime political series The Circus,

Is there room for a centrist, a centrist independent when we have become such a partisan country? And you've got some so far to their own corner in Trump that people want a response, not a — not a beige envelope.

Though always liberal, Colbert in 2019 has shifted hard-left. Talking to Alexandria Ocasio-Cortez, he hailed the “media virtuoso” who doesn’t give a “f**k.” Also in January, he held hands with 2020 candidate Kirsten Gillibrand. Colbert lobbed this softball to Senator Harris: “What makes you happy?”

A partial transcript is below.