A day after Mayor Vince Gray led a voting rights demonstration and marched with protestors for D.C. autonomy, he was hit with a front page Washington Post story that dives deeply into the aggressive federal investigation of his 2010 mayoral campaign. Nikita Stewart reports that the U.S. attorney’s office is scrutinizing Gray, his associates and his campaign staff. The criminal probe continues to loom over the administration, eclipsing what success Gray has had during his nearly 10 months in office.

The investigation was catalyzed by mayoral candidate Sulaimon Brown’s allegation that he was paid by the Gray campaign to criticize then-Mayor Adrian M. Fenty during last year’s primary. Brown says in exchange, he was promised a city job. Federal investigators are also looking to determine whether Gray violated city campaign regulations. The story includes a handy flow chart titled, “Connections under investigation.” The Post reports:

Gray took office with great expectations and the general goodwill of the city. But a Washington Post poll in June found that trust in him has eroded since Brown’s allegations became public and the U.S. attorney’s office began its investigation. Gray has stumbled in hiring staff — missteps at times magnified by ongoing investigations, including one by a congressional oversight committee.

With federal authorities asking questions across the city and presenting their case to a grand jury, Gray’s administration remains under considerable scrutiny.

U.S. Attorney Ronald C. Machen Jr. declined to be interviewed about the investigation. But his spokesman, Bill Miller, said, “We are continuing to look into this.”