(CNN) As House Democratic leader Nancy Pelosi clears hurdles in her bid to become the next speaker, nine members of her own party circulated a letter on Friday indicating they will not support her bid for the top leadership role unless she endorses their proposed changes to House rules.

Nine of the 24 House Democrats who are members of the Problem Solvers Caucus -- a bipartisan group -- signed the letter, which asked for changes that would, in essence, empower rank-and-file members to push bills in the House, a power now reserved for the leadership.

"While we appreciate Leader Pelosi's broad commitment to our effort, we have yet to receive specific commitments to our proposed rules changes that would help 'Break the Gridlock' and allow for true bipartisan governing in this new era of divided government," the group wrote.

The letter's signees condemn "obstructionism and pure partisanship" in current politics and note that there has been a "stalemate" in recent discussions with Pelosi but hope to work toward a consensus.

According to a source familiar, the nine members who signed are: Reps. Thomas Suozzi of New York; Tom O'Halleran of Arizona; Josh Gottheimer of New Jersey; Daniel Lipinski of Illinois; Kurt Schrader of Oregon; Stephanie Murphy of Florida; Jim Costa of California; Darren Soto of Florida; and Vicente Gonzalez of Texas.