Having underestimated the resilience of the public option before, I'm naturally a bit reluctant to do so again. But with three or four Senators threatening to filibuster a bill that contains a public option, it's time for a review of the landscape.The fundamentals of the public option are, in some sense, still fairly strong. It polls well. Perhaps more importantly, the CBO seems to think that it would save money. For this reason, I don't think we can completely rule out the possibility that Lincoln, Nelson, et. al. could be persuaded about its merits. Also, importantly, the bill that will be…