As Democrats and Republicans alike are calling for Virginia Gov. Ralph Northam to resign over a racist photo of him in his medical school yearbook, it's worth looking back at an old tweet from Sen. Kamala Harris (D-Calif.), who is running for president.

On the night Northam won the governorship in November 2017, Harris tweeted a congratulations to Northam that has aged extremely poorly in light of recent events.

"Congratulations to @RalphNortham and his team for showing that Virginia won't stand for hatred and bigotry," Harris wrote, quote-tweeting an Associated Press tweet announcing Northam's victory.

Less than a year and a half later, Harris has been forced to change her tone dramatically on Northam, now calling for him to resign.

"Leaders are called to a higher standard, and the stain of racism should have no place in the halls of government," Harris wrote Friday. "The Governor of Virginia should step aside so the public can heal and move forward together."

The uproar is over a photo in the 1984 yearbook of Eastern Virginia Medical School showing two men. One was dressed in blackface, and the other was in a full Ku Klux Klan costume.

Northam admitted he was in the photo, but he has not said which person he is, or given any explanation about the context in which the photo was taken or why he allowed it to be immortalized in his medical school yearbook.

Northam himself has at least one tweet that now looks a bit foolish in light of what we now know. In the aftermath of the Charlottesville riots, Northam wrote "We sent a clear message that these white supremacists are not welcome in the Commonwealth."

Physician, heal thyself.