Mindful of the election problems in Florida four years ago, aides to Senator John Kerry, the presumptive Democratic presidential nominee, say his campaign is putting together a far more intricate set of legal safeguards than any presidential candidate before him to monitor the election.

Aides to Mr. Kerry say the campaign is taking the unusual step of setting up a nationwide legal network under its own umbrella, rather than relying, as in the past, on lawyers associated with state Democratic parties. The aides said they were recruiting people based on their skills as litigators and election lawyers, rather than rewarding political connections or big donors.

Lawyers for the campaign are gathering intelligence and preparing litigation over the ballot machines being used and the rules concerning how voters will be registered or their votes disqualified. In some cases, the lawyers are compiling dossiers on the people involved and their track records on enforcing voting rights. The disputed 2000 presidential election remains a fresh wound for Democrats, and Mr. Kerry has been referring to it on the stump while assuring his audiences that he will not let this year's election be a repeat of the 2000 vote.

''A million African-Americans disenfranchised in the last election,'' he said at the N.A.A.C.P. convention in Philadelphia on Thursday. ''Well, we're not just going to sit there and wait for it to happen. On Election Day in your cities, my campaign will provide teams of election observers and lawyers to monitor elections, and we will enforce the law.''