The party establishment must be horrified to see Obama cruise through the primary, but there aren’t any other good candidates for it to coalesce behind. It’s probably too late for someone like Hillary Clinton to jump in and save the day, so the only hope the Democrats have left is a brokered convention.
This may anger some, but it’s past time for the adults in the Democratic Party to seize control of things and keep the party from throwing away any chances it has.
The primaries are supposed to be to find the strongest candidate for the general election, but that route is simply failing for the Democrats this time. The Republican primary field has at least offered a few options people can imagine doing a decent job as president, but the reason for Obama’s easy success so far in the Democratic primaries (the fact that he’s the incumbent) means no one will be able to imagine that about the Democratic nominee.