Catherine Engelbrecht, president of the Houston-based group, claimed the Ohio Democratic Party was behind pressure that led several local Ohio candidates to withdraw their permission for the group's members to act as election observers.
Elsewhere, the Election Protection coalition reported problems with ballot scanners in the Ohio cities of Cleveland, Dayton and Toledo; late-opening polling places in minority neighborhoods in Galveston, Texas; and some precincts in the Tampa, Fla., area where voters were redirected to another polling place where they must cast a provisional ballot.
Both political parties in Nebraska accused each other of voter disenfranchisement after a woman claimed she was handed a ballot already filled out for Romney and Republican Rep. Lee Terry — a situation elections officials chalked up to a mistake. The GOP, meanwhile, contended some voters were being falsely told in recorded phone calls that they were ineligible to cast ballots.
In New Orleans, advocates said they received several complaints from large Vietnamese American communities that in at least three major polling places, language services were not being provided to voters needing help with translations. Of particular concern were several proposed constitutional amendments and ballot initiatives, said Jennifer Coco, a volunteer field director with the Louisiana Election Protection Program.
Meanwhile, voters in several storm-ravaged areas in New York and New Jersey expressed relief and even elation at being able to vote at all, considering the devastation from Superstorm Sandy. Lines were long in Point Pleasant, N.J., where residents from the Jersey Shore communities of Point Pleasant Beach and Mantoloking had to cast their ballots due to damage in their hometowns. Many people still have no power eight days after Sandy pummeled the shore.
"Nothing is more important than voting. What is the connection between voting and this?" said Alex Shamis, a resident of hard-hit Staten Island, gesturing to his mud-filled home.
Any voting problems are being closely monitored after months of legal and political battles over more voter ID restrictions and other laws, mostly fruitless hunts for supposedly ineligible people on voting rolls in many states and sustained claims that black and Hispanic voters are being targeted for intimidation and suppression.
Many of these issues could resurface in the courts after Tuesday, particularly if the race between Obama and his Republican challenger, Romney, is too close to call or heads for a recount in states such as Ohio or Florida.
The Justice Department had about 780 observers at key polling places in 23 states to ensure compliance with the 1965 Voting Rights Act and look into any allegations of voter fraud.
Associated Press writers Suzanne Gamboa in Washington; Tamara Lush in St. Petersburg, Fla.; A.J. Connelly in New York; Andrew Welsh-Huggins in Columbus, Ohio; and Patrick Walters in Philadelphia contributed to this report.
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