Politico reports:
The strongest voices lobbying Joe Manchin to change Senate rules and advance elections reform aren’t liberal activists or die-hard filibuster opponents. Instead, they're a small group of his friends who once shared his reluctance.
There's more:
Manchin has told colleagues that his phone line has been lighting up with prominent names outside the Senate in recent days. He’s heard from former Presidents Bill Clinton and Barack Obama and talk-show legend Oprah Winfrey, plus former staffers to both Manchin and former Sen. Robert Byrd (D-W.Va.), according to a person familiar with the talks. Manchin's office declined comment on those calls.
Oprah is more than a celebrity: she's an important person in the Democratic party.