In a New York Times/CBS News Poll last month, fewer than one in 10 respondents knew that the Obama administration had lowered taxes for most Americans. Half of those polled said they thought that their taxes had stayed the same, a third thought that their taxes had gone up, and about a tenth said they did not know. As Thom Tillis, a Republican state representative, put it as the dinner wound down here, “This was the tax cut that fell in the woods — nobody heard it.”