T. M. O.
By overplaying this gaffe and/or miscalculation, we make it seem an aberration. A toned down response suggests, quite correctly, that such lapses in propriety are to be expected from them. Liberals think in terms of groups, not individuals. It is "naturally" more important to the Democratic candidates that Mary Cheney is a lesbian, less important that she is someone's daughter.
That John Kerry doesn't understand why Dick and Lynn Cheney are indignant is further evidence of how distant he is from those of us not sitting down to diver sea scallops for dinner. And that's a point best made subtly - often, but subtly.