Georgia's outdated voting machines are in the spotlight as election integrity advocates try to convince the state's highest court that a judge shouldn't have dismissed a lawsuit challenging the outcome of November's race for lieutenant governor.

The lawsuit says tens of thousands of votes were never recorded in the race and the contest was "so defective and marred by material irregularities" as to place the result in doubt. It contends an unexplained undervote in the race was likely caused by problems with the state's paperless touchscreen voting machines.

Republican Geoff Duncan beat Democrat Sarah Riggs Amico by 123,172 votes to become lieutenant governor. Amico is not a party to the lawsuit, which was filed in November by the Coalition for Good Governance, an election integrity advocacy organization; Smythe Duval, who ran for secretary of state as a Libertarian; and two Georgia voters. It was filed against Duncan and election officials.

A judge dismissed the lawsuit in January. In an appeal to the Georgia Supreme Court, lawyer Bruce Brown argues the judge erred by not allowing discovery prior to trial. But even without evidence that might have turned up in discovery, it's clear that the election was flawed enough to "place in doubt the result," he wrote.