Yasinsac, who serves the voting subcommittee of the U.S. Association for Computing Machinery, sees the potential for trouble when voting jurisdictions switch voting systems suddenly, without having time to train workers and test the systems.
"It's difficult to get voting procedures to change in a short period of time," Yasinsac said. "There have been issues ... already of not having the procedures in place and not having experienced people who've run that type of system before."
Still, Yasinsac generally believes voting officials have worked hard to minimize problems. Since 2004, more than 20 states have moved toward requiring backup paper records with touch-screen e-voting machines. "My understanding and experience is that elections officials are ready for this election, and folks should go to the polls with confidence that they will be able to vote in a timely and efficient manner," he said.
When they're using electronic voting machines, voters should look out for problems, such as vote-flipping that some voters have reported in West Virginia, Yasinsac said.
State officials defended their efforts, saying they expect elections to run smoothly. Ohio, with about 660,000 new voter registrations since the 2006 election, has taken several steps to ensure a smooth election, said Jeff Ortega, a spokesman for the secretary of state. In the 53 Ohio counties that use touch-screen machines, voters will have the option of voting on paper ballots, and paper ballots will be available if machines malfunction, he said.
In Pennsylvania, where nearly 400,000 people have registered as new voters since late April, the Department of State has been urging counties to increase the number of voting machines, said Rebecca Halton, a spokeswoman. Pennsylvania uses a mix of touch-screen and optical scan machines.
The state doesn't have early voting or no-excuse absentee voting, but voting officials are ready for high turnouts, Halton said. "We're confident in everyone's level of preparation for Tuesday," Halton said. "We're really looking forward to Tuesday."
Still, Halton advised Pennsylvania voters to go to the polls during off-peak times, not when polls open in the morning, at lunch or after work. "Come prepared for a line -- bring a book," she said.
Virginia, which uses a combination of optical scan and touch-screen machines, is also ready for record numbers of voters, said Jessica Lane, a spokeswoman for the Virginia State Board of Elections. Virginia does not allow early voting other than absentee voting, which voters need to qualify for.
As of Thursday, more than 429,000 Virginia voters had applied for an absentee ballot, and more than 312,000 had returned a voted ballot. In 2004, 222,059 absentee ballots were cast in Virginia.
"We have the most registered voters in Virginia history," Lane said. "We are prepared for lines and we feel we have done the best we can with the resources we have available."
Virginia had nearly 6,000 voting machines in 2004 and will have 10,600 voting machines this year, Lane said.