Media outlets reported that Plame was outed as a CIA operative because her husband Wilson wrote a highly critical editorial about the Bush administration.
Taken in context, Plame was outed because she sent her husband on a 'fact finding' mission, this meant she no longer separated her professional and personal life. She'd essentially become a liability since her judgement had become impaired, especially when one considers her husband's obligations as journalist are quite different than hers as a CIA operative.
Cheney objected to her loose cannon status, and remedied the situation. Quite effectively I might add, HR would have taken much longer.
I propose Emma Thompson play Valerie Plame in the Fox TV movie!