Democrats are fond of accusing their Republican opponents of doing the bidding of wealthy or corporate bankrollers, including on gun policy. Yet the power of the NRA and other gun control opponents has little to do with the money they spend on campaigns, instead reflecting the redefinition of gun ownership as a strong political identity. Most Americans may support additional restrictions on access to firearms, especially in the wake of a school shooting like this week's tragedy in Nashville. But there is no countervailing identity of "non-ownership" to motivate the other side of the debate, as I explain in today's column for Bloomberg Opinion. (The piece is also available via the Washington Post.)