She also was a (if not THE) key deciding Dem who helped give us the fascist scum Emil Bove on the Third Circuit Court of Appeals (and made him a prime candidate for Trump to elevate to the SCOTUS) when she was the first Dem to come out against Adeel Mangi:
In March 2024, Cortez Masto announced she would not support President Biden's nomination of Adeel Mangi to the Third Circuit U.S. Court of Appeals, citing his association with the Alliance of Families for Justice, a criminal justice reform group that advocates on behalf of families affected by mass incarceration. His nomination remained blocked, and in November 2024 it was withdrawn, leaving the position open for the incoming Trump administration to fill.
https://en.wikipedia.org/wiki/Adeel_A._Mangi
On November 21, 2024, Senator Chuck Schumer announced that he had made a deal with Senate Republicans to withhold floor votes on Mangi and three other Biden appellate nominees in exchange for permitting several district court judges' nominations to go forward to floor votes.
In a letter to President Biden dated December 16, 2024, Mangi wrote that the Judicial Confirmation process in the United States is "fundamentally broken" and emphasized the risk nomineesparticularly minoritiesare exposed to in the confirmation process. Mangi reiterated how attacks against him had not sought to engage in questioning of his qualifications, but rather sought to perpetuate Islamophobic rhetoric and raise money for committee members' political campaigns through "performative McCarthyism."
In July 2025, the Senate confirmed Emil Bove to fill the vacancy.
https://www.huffpost.com/entry/catherine-cortez-masto-adeel-mangi-judicial-nominee_n_65fa4f50e4b03f22de6133f4