Scattering to the Exits

What's with all of these Democratic Congressmen who are leaving Congress?
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It seems like the Democratic majority is imploding into itself.  They have the power and the votes to make a change, and are unable to do so.  We know that they can throw rocks, but now that they have the tools, they can't build anything.
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Am I being too critical here?  Patrick Kennedy, William Delahunt, at least two others in the past two weeks.  All of a sudden, they don't care too much about change.  Change is good as long as they don't have to be the ones to put in the time and effort to effect it.
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You would think that someone with the leadership skill of Speaker Nancy Pelosi could stem the tide of these costly resignations.
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And Obama seems to be wallowing in rhetoric and ineffectiveness.  All of that executive experience at the Chicago ACORN agency doesn't seem to be kicking in.
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It is approaching mid term.  The light in the room has been turned on and it seems like there is quite a bit of scattering to the exits.