Can policy be both wise and aggressively partisan? Ask any Republican worth his salt and the answer will be an unequivocal yes. Ask a Democrat of the respectable Beltway variety and he will twist himself into a pretzel denying it.

For decades Republicans have made policy with a higher purpose in mind: to solidify the GOP base or to damage the institutions and movements aligned with the other side. One of their fondest slogans is "Defund the Left," and under that banner they have attacked labor unions and trial lawyers and tried to sever the links between the lobbying industry and the Democratic Party. Consider as well their long-cherished dreams of privatizing Social Security, which would make Wall Street, instead of Washington, the protector of our beloved seniors. Or their larger effort to demonstrate, by means of egregious misrule, that government is incapable of delivering the most basic services.

That these were all disastrous policies made no difference: The goal was to use state power to achieve lasting victory for the ideas of the right.

On the other side of the political fence, strategic moves of this kind are fairly rare. Instead, for most of my lifetime, prominent Democratic leaders have been chucking liberalism itself for the sake of immediate tactical gain.

Former President Bill Clinton, who is widely regarded as a political mastermind, may have sounded like a traditional liberal at the beginning of his term in office. But what ultimately defined his presidency was his amazing pliability on matters of principle. His most memorable innovation was "triangulating" between his own party and the right, his most famous speech declared and end to "the era of big government," his most consequential policy move was to cement the consensus on deregulation and free trade, and many of his boldest stands were taken against his own party.