Writing on Politico, Richard Whitmire posits that it could happen if our eventual Democratic nominee fails to find his or her way back to the center:
Recent victories on the reform agenda side, such as high-flying charters and the astonishing success of Teach for America, have captured the imagination of young, independent-minded Democrats. If the Democratic nominee fails to tack back to the center, these voters may be open to a switch. Pushing hard on charters, for example, could add up to a reform platform akin to Bush’s “I’ll bring you Texas” accountability, which fleshed out his “compassionate conservative” credentials.
Eduwonk is on it here. Russo has it here.