Republican Party officials in Ohio took formal steps yesterday to place thousands of recruits inside polling places on Election Day to challenge the qualifications of voters they suspect are not eligible to cast ballots.

Party officials say their effort is necessary to guard against fraud arising from aggressive moves by the Democrats to register tens of thousands of new voters in Ohio, seen as one of the most pivotal battlegrounds in the Nov. 2 elections.

Election officials in other swing states, from Arizona to Wisconsin and Florida, say they are bracing for similar efforts by Republicans to challenge new voters at polling places, reflecting months of disputes over voting procedures and the anticipation of an election as close as the one in 2000.

Ohio election officials said they had never seen so large a drive to prepare for Election Day challenges. They said they were scrambling yesterday to be ready for disruptions in the voting process as well as alarm and complaints among voters. Some officials said they worried that the challenges could discourage or even frighten others waiting to vote.

Ohio Democrats were struggling to match the Republicans' move, which had been rumored for weeks. Both parties had until 4 p.m. to register people they had recruited to monitor the election. Republicans said they had enlisted 3,600 by the deadline, many in heavily Democratic urban neighborhoods of Cleveland, Dayton and other cities. Each recruit was to be paid $100.

The Democrats, who tend to benefit more than Republicans from large turnouts, said they had registered more than 2,000 recruits to try to protect legitimate voters rather than weed out ineligible ones.

Republican officials said they had no intention of disrupting voting but were concerned about the possibility of fraud involving thousands of newly registered Democrats.

"The organized left's efforts to, quote unquote, register voters - I call them ringers - have created these problems," said James P. Trakas, a Republican co-chairman in Cuyahoga County.

Both parties have waged huge campaigns in the battleground states to register millions of new voters, and the developments in Ohio provided an early glimpse of how those efforts may play out on Election Day.

Ohio election officials said that by state law, the parties' challengers would have to show "reasonable" justification for doubting the qualifications of a voter before asking a poll worker to question that person. And, the officials said, challenges could be made on four main grounds: whether the voter is a citizen, is at least 18, is a resident of the county and has lived in Ohio for the previous 30 days.

Elections officials in Ohio said they hoped the criteria would minimize the potential for disruption. But Democrats worry that the challenges will inevitably delay the process and frustrate the voters.

"Our concern is Republicans will be challenging in large numbers for the purpose of slowing down voting, because challenging takes a long time,'' said David Sullivan, the voter protection coordinator for the national Democratic Party in Ohio. "And creating long lines causes our people to leave without voting.''

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Among the main swing states, only Ohio, Florida and Missouri require the parties to register poll watchers before Election Day; elsewhere, party observers can register on the day itself. In several states officials have alerted poll workers to expect a heightened interest by the parties in challenging voters. In some cases, poll workers, many of them elderly, have been given training to deal with any abusive challenging.