Collective Action

I think Brendan Nyhan's right in his explanation of why Democratic Party leaders are unlikely to unite to push Hillary Clinton out of the race even though they'd all benefit if it could be done -- it's hard to coordinate, and nobody wants to bear the costs of alienating Clinton's still-sizeable fan base. Still, dribs and drabs of superdelegates could, in sufficient numbers, succeed in pushing her out by May 6 as long as Obama turns in a decent performance in the upcoming primaries.