How it works, in a nutshell.
From the article:
To hear Republicans tell it, they are waging a virtuous campaign to crack down on rampant voter fraud – a curious position for a party that managed to seize control of the White House in 2000 despite having lost the popular vote. […] Even at the time, there was no evidence to back up such outlandish claims. A major probe by the Justice Department between 2002 and 2007 failed to prosecute a single person for going to the polls and impersonating an eligible voter, which the anti-fraud laws are supposedly designed to stop. Out of the 300 million votes cast in that period, federal prosecutors convicted only 86 people for voter fraud – and many of the cases involved immigrants and former felons who were simply unaware of their ineligibility. A much-hyped investigation in Wisconsin, meanwhile, led to the prosecution of only .0007 percent of the local electorate for alleged voter fraud. “Our democracy is under siege from an enemy so small it could be hiding anywhere,” joked Stephen Colbert. A 2007 report by the Brennan Center for Justice, a leading advocate for voting rights at the New York University School of Law, quantified the problem in stark terms. “It is more likely that an individual will be struck by lightning,” the report calculated, “than that he will impersonate another voter at the polls.”
I bolded that last sentence. IT’S FREAKING MORE LIKELY AN INDIVIDUAL WILL BE STRUCK BY LIGHTNING THAN THAT HE WILL FREAKING IMPERSONATE A VOTER AT THE FREAKING POLLS!