might be a scattered shower oro welate day storm, day dry, 87 te high. >>> thanks, tucker.t >>> we continuew breaking news out of arlington. police are investigating avest deadly hit-and-run. it happened around 6:00 on route 110 north near the pentagon and arlington cemetery. police responded to a call for c body on the road, and vehicle nearby. the vehicle was gone when police arrived. two northbound and two southbound lanes of route 110 are closed right now, and police are asking drivers to avoid thee area. we're going to talk live with arlington county police in a few minutes. >>> another challenge to the forward able care act.re house republicans are about 4 hours from voting on a bill toil overreturn the president's law.d it follows an emergency meeting bye the house rules committee yesterday, but the vote would be a symbolic effort after the white house issued a veto threat. in the meantime, new numbers from the department of health and human services show exactly how many people the expansion of medicaid programs have helped in the first half of 2012. but those service, like mammogra