Wow, this Washington Post story is really worth reading:

Florida neurologist Marc Swerdloff was taken aback when one of his patients with advanced dementia voted in the 2000 presidential election. The man thought it was 1942 and Franklin D. Roosevelt was president. The patient’s wife revealed that she had escorted her husband into the booth.

“I said ‘Did he pick?’ and she said ‘No, I picked for him,’ ” Swerdloff said. “I felt bad. She essentially voted twice” in the Florida election, which gave George W. Bush a 537-vote victory and the White House.

As swing states with large elderly populations such as Florida gear up for another presidential election, a sleeper issue has been gaining attention on medical, legal and political radar screens: Many people with advanced dementia appear to be voting in elections — including through absentee ballot. Although there are no national statistics, two studies in Pennsylvania and Rhode Island found that patients at dementia clinics turned out in higher numbers than the general population.