The only source so far is the man who released the video, James O’Keefe. He posted the following Facebook status update a few minutes ago.
Rep. Moran apparently made the decision after his son appeared in a video released earlier today. In that video, Pat Moran, a full-time paid staffer on Rep. Moran’s re-election campaign, is seen advising undercover reporters how to engage in voter fraud.
Update: TPM reports that Patrick Moran has “resigned.”