BIRMINGHAM, Ala. — The Senate election in Alabama on Tuesday is not just about the choice between Doug Jones and Roy Moore. It’s also about a voter suppression campaign that may well sway the result of a close race.

In 2011, Alabama lawmakers passed a photo ID law, ostensibly to combat voter fraud. But “voter impersonation” at polling places virtually never happens. The truth is that the lawmakers wanted to keep black and Latino voters from the ballot box. We know this because they’ve always been clear about their intentions.

A state senator who had tried for over a decade to get the bill into law, told The Huntsville Times that a photo ID law would undermine Alabama’s “black power structure.” In The Montgomery Advertiser, he said that the absence of an ID law “benefits black elected leaders.”

The bill’s sponsors were even caught on tape devising a plan to depress the turnout of black voters — whom they called “aborigines” and “illiterates” who would ride “H.U.D.-financed buses” to the polls — in the 2010 midterm election by keeping a gambling referendum off the ballot. Gambling is popular among black voters in Alabama, so they thought if it had remained on the ballot, black voters would show up to vote in droves.