Do you have any data to back up this assertion? The latest list of sponsors I've found, from 2019, shows these companies in the $1,000,000+ category. Can you spot a single one that is "left leaning"? (I'm tempted to make a bad joke here about a misunderstanding around the name "Progressive Insurance".)

Angie’s List

General Motors Corporation

Lumber Liquidators

Northwestern Mutual Foundation

Novo Nordisk

Progressive Casualty Insurance Company

Prudential Financial

State Farm Mutual Automobile Insurance Company

https://media.npr.org/documents/about/annualreports/NPRSpons...

Pretty sure that was also the case before they found religion.