At fivethirtyeight.com Nate Silver puts Mr Obama’s chances of winning at 80.9 per cent, citing slim but solid leads in Iowa, Nevada, Ohio and Wisconsin. Silver tweeted ex-Republican congressman and NBC presenter Joe Scarborough, who has been needling him: “If you think it’s a toss-up, let’s bet. If Obama wins, you donate $1,000 to the American Red Cross. If Romney wins, I do. Deal?” Scarborough declined.