The state elections agency is investigating complaints about a massive campaign mailing Republican Sen. John McCain's presidential campaign has directed toward Wisconsin Democrats and other voters.

Each mailing includes at least one copy of the state application for an absentee ballot that has the address of a local clerk and a box for postage printed on the other side.

But in some cases, the incorrect clerk's address is printed on the application, leading some Democrats to wonder if the Arizona senator's campaign is deliberately trying to get them to apply for absentee ballots in places where they aren't eligible to vote.