By By THERESA VARGAS The Washington Post WASHINGTON - Ricardo Pineda was hesitant to wear his uniform. Two years had passed since he had served in the Army. Then again, so much was at stake, and the disabled veteran knew the uniform would leave no confusion about who he was: a man who had been willing to die for this country and now needed help to keep his family living in it. Pineda straightened the nameplate on his dress blues one day last month and entered a room in the Rayburn House Office Building, where he took a seat at a wooden table with members of the Congressional Hispanic Caucus.