View Photo Gallery: Leonard B. Robinson has spent thousands on his Batman costume and memorabilia, which he hands out to area children hospitalized with life-threatening illnesses. Read related story.

Who is the Route 29 Batman? When the masked superhero was pulled over last week, the story went viral. The Post’s Michael Rosenwald tracked him down.

Ready, set, elect. Prepare for Tuesday’s primary elections in the District and Maryland with our Voter’s Guides.

Other cities fuel D.C. population boom. New census data shows many newcomers to the city arrive from other major metro areas, while the District loses more residents to the Washington-area suburbs than it gains from those jurisdictions.

Ex-TSA official charged in sex party. A former Transportation Security Administration manager at Dulles International Airport is charged in what police call a prostitution scheme at a Silver Spring hotel; he says it was a free swingers party.

Gas prices top $4 per gallon. D.C. drivers should brace for sticker shock. Prices are expected to continue to rise into record territory.

Coming up on PostLocal:

— The former Prince George’s County jail guard who allegedly ignored an inmate’s apparent need for medical care is expected to be arraigned Thursday. Anthony McIntosh was charged with civil rights violations in the 2008 death of the inmate, Ronnie White, in January.

— Live chats: The owner of Miss Pixie’s on 14th Street chimes in about vintage furniture in the Home Front chat at 11 a.m. At 1 p.m., the Going Out Gurus help you plan your weekend.

View Photo Gallery: Every time gas prices soar, Americans get a reminder of how dependent we are on oil.