Executive Privilege for White House Social Secretary?

How far has the accountability bar fallen? A Congressional committee invited the White House social secretary to testify how two uninvited guests crashed a Thanksgiving week state dinner. It provided a George W. Bush like refrain:

White House press secretary Robert Gibbs said allowing Rogers to testify before Congress would violate the constitutional separation of powers between the legislative and executive branches of government.

Congressional oversight has is rooted in the Constitution. We can add Desiree Rogers name to Nancy-Ann DeParle, Frances Townsend and Tom Scully. All refused to testify before Congressional Committees.

Desiree Rogers-Obama Social Secretary

Nancy-Ann DeParle-Obama Health Czar

Frances Townsend-Bush Homeland Security Adviser during Hurricane Katrina

Tom Scully-Bush Medicare/Medicaid Chief during Part D-Prescription Drug passage

Two are red, two are blue, but in all cases the White House said "____ you." Ari Fleischer, Scott McClellan, Tony Snow, Dana Perino, Phil Gibbs and Valerie Jarrett. It's hard to tell the parties apart.