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...just because it really needs to be rammed home...
It seems pretty obvious that there are a fair few trolls here with an agenda of driving division as far as they can... it's very unlikely that any of these trolls are in fact genuine supporters of the Democratic Party, whoever the nominee may be... don't be fooled, people. Given the Dems' much vaunted online and netroots strength, it's obvious that this would be among the first places to divide and conquer. What could be nicer for that nice Mr. McCain than a Democratic Party helpfully fighting itself, not him.
Don't be fooled. Just ignore them. No real Democrat is going to vote for four more years of the same. On the other hand, if you were a Republican strategist, this is precisely the kind of McCain-benefiting activity you'd be carefully engineering.
Don't be fooled. It'll get worse between now and the election.
Don't be fooled.