A Democratic nominee for the Federal Election Commission has pulled his name from consideration, a move that may further prolong the Senate impasse over filling four FEC vacancies.

Democrats had hoped to return Robert Lenhard, a former chairman of the commission, to the FEC. But Lenhard no longer wants to be considered due to the delay over the nomination process, according to a letter from Senate Majority Leader Harry ReidHarry ReidSanders and Schumer are right: Ellison for DNC chair The Hill's 12:30 Report Hopes rise for law to expand access to experimental drugs MORE (D-Nev.) to White House chief of staff Joshua Bolten.

"[Lenhard] is exceptionally well-qualified and his nomination is not controversial," Reid wrote. "However, given the complete unwilligness among Republicans to constitute a functional FEC, I could not assure him of timely confirmation."

Senate Democrats have held up votes to confirm the four pending nominees due to their objection to Republicans' choice of Hans von Spakovsky. While Republicans have called for one vote to confirm all four nominees as a bloc, Democrats have sought a separate vote for each nominee, believing that von Spakovsky does not have enough support for confirmation. Democrats, led by Barack ObamaBarack ObamaDHS may relax hiring requirements to meet border agent goal: report New DNC chairman wastes no time going after Trump US weighs withdrawal from UN Human Rights Council: report MORE, have concerns over von Spakovsky's voting rights record in Georgia and as a lawyer in the Department of Justice.

Reid wrote that the search for a new Democratic nominee and the process to get one confirmed typically takes seven months.

The FEC has only two current members, which isn't enough for a quorum.

Read Reid's letter here (.pdf).