University of Pennsylvania Climate Scientist Demands Supreme Court Packing Pledge From Democratic Candidates

Michael Mann, vice provost for Climate Science, Policy, and Action at the University of Pennsylvania, has elevated demands that Democratic candidates commit to expanding the Supreme Court as a condition of party support. During a recent podcast appearance with Peter Dominick, Mann explicitly stated that Senate candidates must accept this position or face exclusion from the party’s backing, framing court expansion as essential to advancing environmental policy objectives.

Mann justified his position by arguing that environmental concerns necessitate Democratic electoral victories and that opposition to court expansion disqualifies candidates from party consideration. “There’s no way not to be partisan. There’s no way not to be political here,” Mann said, adding that candidates must demonstrate willingness to alter the court’s composition to be considered viable Democrats.

The University of Pennsylvania professor’s remarks align with earlier statements from prominent Democratic figures including Vice President Kamala Harris and former Transportation Secretary Pete Buttigieg, who have similarly advocated for fundamental changes to the Supreme Court’s structure and composition.

Mann’s legal history includes a 2021 defamation case against bloggers Rand Simberg and Mark Steyn over criticism of his climate research. A D.C. Superior Court judge later reduced punitive damages in that case and sanctioned Mann’s legal team for what the court found to be “bad-faith trial misconduct,” including allegedly misrepresenting grant losses to the jury. Mann was ordered to pay $1.1 million in his critics’ legal fees following the court’s findings.

During the original defamation trial, Mann’s legal team presented a grant valued at $112,000 as worth $9.7 million, according to court records. Judge Alfred S. Irving Jr. found the award “grossly excessive” and reduced damages substantially, determining the misrepresentations constituted “an affront to the Court’s authority.”

Mann has also mischaracterized recent Supreme Court decisions regarding agency authority. He claimed the Court ruled that the EPA lacks authority to make environmental regulations based on scientific findings, but the 2024 decision in Loper Light Enterprises v. Raimondo merely restored traditional judicial review standards rather than eliminating EPA rulemaking power.

The call for universal Supreme Court expansion pledges represents an escalation in Democratic pressure on party candidates. Political strategist James Carville previously suggested Democrats pursue court expansion without public discussion, while Mann and others including former Attorney General Eric Holder now openly frame such measures as explicitly partisan objectives rather than principled constitutional positions.