PARIS: The French presidential race entered the home straight Sunday with both incumbent right-winger Nicolas Sarkozy and Socialist frontrunner Francois Hollande battling to shake off the taint of scandal.

Sarkozy accused Hollande supporters in the media of mounting a “despicable”smear against him by publishing a document purporting to show Moamer Khadafi's former Libyan regime agreeing to fund his previous presidential campaign in 2007.

Meanwhile, the Socialists were embarrassed when several senior figures in Hollande's campaign attended an ally's birthday celebration and found that disgraced former IMF chief Dominique Strauss-Kahn had also been invited.

Both events revived interest in these long-running scandals just one week before France goes back to the polls and just days before Hollande and Sarkozy were to face off in a televised debate which could prove decisive.

The latest opinion poll published on Sunday by the LH2 institute for web portal Yahoo! forecast that Hollande would comfortably win the May 6 run-off by 54 percent of the vote to Sarkozy's 46, with the gap narrowing.

But polling has yet to take into account the effects, if any, of the latest controversies, neither of which appear fatal to either campaign, but which may reinforce the voters' broader disdain for the political class.

On Saturday, investigative news website Mediapart published what it said was a copy of an internal Libyan regime document recording an alleged 2006 illegal funding deal between Tripoli and Sarkozy's 2007 campaign.

According to the note, which Mediapart claims to have obtained from former regime figures ousted last year in the revolt against Khadafi's rule, Tripoli agreed to pay Sarkozy's 2007 campaign $66 million.

“It's despicable. It's a forgery. Mediapart is well used to dishonesty.

It's an agency in the service of the left,” Sarkozy declared in an interview with Canal+ television, angrily dismissing the claim.

There are long-standing rumours that Sarkozy's victorious 2007 campaign benefited from illegal foreign funds, and Mediapart has been at the forefront of reporting on his camp's alleged links to shady middlemen.

Sarkozy's prime minister, Francois Fillon, also attacked former Socialist favourite Strauss-Kahn, accusing him of intervening in the campaign to make false allegations against Sarkozy. Strauss-Kahn reportedly alleged in an interview with a US reporter that his arrest last year in New York on sex assault charges had been manipulated by Sarkozy's camp for political gain.

Sarkozy has dedicated the closing stages of his campaign to wooing voters who backed the far-right's Marine Le Pen in the April 22 first round, and has lost no opportunity to remind the left of its ties to Strauss-Kahn.