John McCain paid $175,000 of campaign money to a Republican operative accused of massive voter registration fraud in several states, it has emerged.

As the McCain camp attempts to tie Barack Obama to claims of registration irregularities by the activist group ACORN, campaign finance records detailing the payment to the firm of Nathan Sproul, investigated several times for fraud, threatens to derail that argument.

The documents show that a joint committee of the McCain-Palin campaign, the Republican National Committee and the California Republican Party, made the payment to Lincoln Strategy, of which Mr Sproul is the managing partner, for the purposes of “voter registration”.

Mr Sproul has been investigated on numerous occasions for preventing Democrats from voting, destroying registration forms and leading efforts to get Ralph Nader on ballots to leach the Democratic vote.....

...he career of Mr Sproul, a former leader of the Arizona Republican Party, is littered with accusations of foul play. In Minnesota in 2004, his firm was accused of sacking workers who submitted Democratic registration forms, while other canvassers were allegedly paid bonuses for registering Bush voters. There were similar charges in Pennsylvania, West Virginia, Oregon and Nevada.

That year, Mr Sproul’s firm was paid $8,359,161 by the Republican Party, according to a 2005 article in the Baltimore Chronicle, which claimed that this was far more than what had been reported to the Federal Elections Commission.

....In May this year, both ACORN and Mr Sproul were discussed at a hearing of the House subcommittee on commercial and administrative law. One Republican member, Congressman Chris Cannon, concluded: "The difference between ACORN and Sproul is that ACORN doesn't throw away or change registration documents after they have been filled out."