SAN DIEGO -- The nonprofit group that presidential candidate Sen. John McCain said "may be destroying the fabric of democracy" registered more voters in San Diego County this year than anywhere else in California, a local newspaper reported Friday.

The Association of Community Organizations for Reform Now, or ACORN, has registered 24,664 voters just in the county this year compared to 39,600 for the whole state, The San Diego Union-Tribune reported.

The group is currently under investigation nationally by the FBI for allegedly helping to foster voter registration fraud.

Local FBI officials have not commented, but San Diego County Registrar of Voters Deborah Seiler told the Union-Tribune that she has forwarded a handful of problem registrations to the secretary of state for investigation of possible fraud.

A California ACORN spokeswoman told the newspaper that there was a problem with some registration workers but no grand conspiracy to commit fraud.

Local ACORN workers submitted 26,513 registration cards to the county from January to September and of those, 7 percent were found to have incomplete information or invalid information, such as missing signatures or birthdays, the Union-Tribune reported.