Many pointed, in particular, to Colorado as the possible source of a late night November 4, while others suggested that record turnout in states like Virginia and Georgia could challenge local election officials.

“There’s still reason to be concerned in terms of what’s going to take place in November,” said Kimball Brace, whose firm, Election Data Services, advises local governments on election administration…

“In South Florida you’ve got areas that are going to be on their third separate voting technology in their third consecutive presidential election,” said Doug Chapin, the editor of the non-partisan Electionline.org. “Ohio once again is in ground zero for policy changes and litigation.”

Colorado, meanwhile, is still reeling from a true Election Day meltdown in 2006, a technical failure in Denver that may have swung at least one close race.