Center for Public Integrity media bias rating is Lean Left.

The Center for Public Integrity (CPI) is a US-based nonprofit investigative journalism organization whose stated mission is "to reveal abuses of power, corruption and dereliction of duty by powerful public and private institutions in order to cause them to operate with honesty, integrity, accountability and to put the public interest first."[1] With over 50 staff members, CPI is one of the largest nonpartisan, nonprofit investigative centers in America.[2] While CPI describes itself as an organization that is "nonpartisan and does no advocacy work,"[3] the organization has been criticized for coordinating with advocacy groups.[4] CPI has been characterized as a "progressive"[5] and "liberal group."[6][7]

Wikipedia

See how we rate the media bias of other news outlets and writers.

The AllSides Media Bias Rating reflects the average judgment of the American people.

The AllSides Media Bias RatingTM reflects the average judgment of the American people. We don't use a convoluted mathematical or artificial intelligence model, but instead have regular people representing the broad spectrum of Americans blindly rate the bias of articles. That produces a fair, verifiable bias rating.

This media bias rating was determined using the following levels of bias verification.

Basis of Rating:

Blind Survey
Third Party Data
Community Feedback
Editorial Review
Secondary Research

Confidence Level:

Not Available

Unless otherwise noted, this bias rating refers only to news articles on their web site, not from opinion pieces or what is broadcasted on TV or radio. The opinion writers from the same media source may have different bias ratings, so individual writers often are rated separately.