McLaren's Jenson Button says he would not forgive himself if he did not try to defend his Formula 1 crown at the next weekend's Brazilian Grand Prix.Button, who clinched the 2009 title in the Brazil, trails Ferrari's championship leader Fernando Alonso by 42 points with only 50 points up for grabs.
"It is a long shot but I'd regret it for the rest of my life if I chose not to go for it," said Button.
"I've always said I'll fight until it's mathematically impossible for me."
Alonso, the Red Bulls of Mark Webber and Sebastian Vettel and McLaren pair Lewis Hamilton and Button are all still in the title hunt with only two races to go in Brazil and Abu Dhabi on 14 November.
Button needs to finish at least second at Brazil's Interlagos circuit and hope other results go his way.
Two-time champion Alonso, who leads the standings by 11 points from Webber, is the only driver who can clinch the 2010 crown in Brazil.
