WASHINGTON - At midday on Fridays, Muslims gather to pray in a basement room of the U.S. Capitol. Kneeling on sheets they've spread over the floor and facing east toward Mecca, they are members of the Congressional Muslim Staffers Association, about two dozen congressional aides who are part of a small but growing minority in America and in the halls of government. At first just a prayer group, later a Muslim support group, the association is now looking outward to change what many see as woeful ignorance about Islam on Capitol Hill and beyond, said Jameel Aalim-Johnson, a black Muslim...