All right — I hope, though, that my confusion is understandable, given the link in question was staunchly defending MoveOn. :)

Speaking for myself, I see this as endemic to the American system. Duverger is alive and well, and constantly driving American politics to a hypothetical middle, at the expense of the vibrancy and dynamism of minority points of view. The tendency you've been seeing in Hillary, I saw all over the Republican nomination process.

I really wish we could end SMDP–style elections in the United States. Ending that, and ending the secret ballot, would do wonders for elections.