Sen. Elizabeth Warren has already taken herself out of the running to succeed Harry Reid as minority leader, despite an early push from progressives.
Warren's office told National Journal the first-term Massachusetts lawmaker will not run for the position to succeed Reid, who announced he would not run for reelection in 2016.
The idea of a Warren candidacy had been floated by groups such as the Progressive Change Campaign Committee and Howard Dean's Democracy for America.
Many groups on the left have pushed for Warren to run for president, despite her repeated claims she is not running for president, and the Progressive Change Campaign Committee announced its "Ready for Boldness" campaign to promote "big Elizabeth Warren-Style ideas."
Earlier in the day, the committee highlighted an amendment by Warren to expand Social Security as a reason she is someone to be admired by progressives.
Liberal groups are also wary of Sen. Chuck Schumer likely becoming minority leader; they perceive him as too connected to the financial industry in his home state of New York. Reid has already endorsed Schumer for the position.