Last time I checked ( as in United States vs. Nixon) the US Supreme Court affirmed the practise of?

Executive Privilege as an importat part of the Separation of Powers doctrine. Do you think Democrats attempts to file contempt charges against President Bushes aides, Josh Bolten and Harriet Miers (both of who are protected under executive privilege) for failing to testify, motivated by political gain as usual? Who do you think will eventually win this historic power struggle between Congress and the White House