It was hard enough for the Obama administration to defend a series of embarrassing security breaches at the Secret Service. Now, there are new questions about a pre-election White House cover-up. The Washington Post, which has dominated coverage of the embattled agency, reported Wednesday night that the White House knew more than it let on about the involvement of a member of the president's advance team in the prostitution scandal that led to punishment or firing of 12 Secret Service officials in 2012.