The puzzling thing about politicians of either party who claim to be "centrist" or "moderate" is how much they sometimes sound like party-line right-wing Republicans. Distinguishing among these species of politicians can be almost impossible during the current struggle over health care reform, especially when a senator like Blanche Lambert Lincoln of Arkansas tries to explain herself. Like so many of the Republicans they try to emulate, the conservative Democrats claim to worry about spending and deficits -- except with respect to programs that benefit them, their favorite constituents or the lobbyists who pay their campaign expenses. Facing re-election and plummeting poll numbers, Lincoln voted to commence debate last weekend. But then she turned around and warned that she would probably join a Republican filibuster against the Democratic health reform bill. Why? Because the Democratic legislation, favored by a clear majority, is likely to include a public option.---