Chairman Brian Moran helps deliver petitions to the State Board of Elections at the Capitol in Richmond Dec. 2. (AP Photo/Steve Helber)

Moran said he will leave the Association of Private Sector Colleges and Universities Aug. 1 to spend more time on party business.

“There is no question that Virginia Democrats will play a critical role in this year’s election more than we have in modern times, and I do not want to wake up on the morning of November 7th with any doubts about whether or not I gave everything I could to turning Virginia blue for President Obama, Governor Kaine and Democrats across the Commonwealth,’’ he wrote in an email.

The Democratic State Central Committee chose Moran, who made a failed run for governor in 2009, over former Arlington County activist Peter Rousselot in 2010.

Some Democrats have questioned whether Moran’s role at the organization conflicted with his job as chairman. Earlier this year, the association received unwanted attention for its ties with the American Legislative Exchange Council.

Some corporations halted their support of ALEC following scrutiny of “Stand Your Ground” self-defense laws after the death of 17-year-old Trayvon Martin in Florida. The group had lobbied for similar laws in other states.