Why doesn't Nancy Pelosi bring Articles of Impeachment against Obama
Think about it. She would win credibility from her most strongly progressive constituents who are enraged at Obama's "trash the environment" energy policies, apoplectic about his "leave no billionaire behind" economic policies, and livid about his war mongering in Afghanistan, Libya, and Pakistan.
The GOP would reject it out of hand because a Democrat suggested it.
That would seal Obama off from that distraction for the remainder of his presidency and put other Neo-Corporatists on notice.