Democratic presidential nominee US Sen. Barack Obama speaks during a campaign rally at Veterans Memorial Arena in Jacksonville, Florida.[Joe Raedle/Getty Images/AFP]

McCain plans to race through seven swing states by Tuesday morning in a bid to persuade undecided voters that he's the most qualified to lead the US through the aftermath of wars and economic crisis.

On the last day of his 21-month campaign for the White House, Obama told supporters in Jacksonville, Florida, that he could win the longest and most expensive US presidential contest in history.

Barack Obama, Democratic Presidential Candidate, said, "I have just one word for you Florida: tomorrow. This is going to be close here in Florida, this is going to be close all across the country. We're going to have to work like our futures depend on it - for the next 24 hours because it does. Understand at this point I've made the arguments, now it's all about who wants it more, who believes in it more. Florida, the time for change has come."

Monday's USA Today/Gallup poll found likely voters favoring Obama by 11 points over McCain, their support rates being 53 and 42 percent respectively.

Other polls show Obama with a 7 to 8 percentage point lead.

(CCTV November 4, 2008)