If anybody knows anger, it's the Ragin' Cajun himself James Carville:
James Carville, a strategist for former President Bill Clinton and advisor to his wife Hillary's 2008 presidential campaign, hinted Democrat supporters could be angry if Mr Obama lost, given his lead in the polls.
"If Obama goes in and he has a consistent five-point lead and loses the election, it would be very, very, very dramatic out there," he told CNN.
James Tate, of Detroit's police department, which dealt with violent celebrations after the Detroit Tigers won the baseball World Series in 1984, told congressional newspaper The Hill that problems could flare whichever candidate wins.
"Either party will make history and we want to prepare for celebrations," he said. "The worst-case scenario could be a situation that requires law enforcement."
In Chicago, where Mr Obama will hold a rally on November 4, the police department has been meeting to discuss security plans for the night. Law enforcement departments in Philadelphia and Cincinnati are also making preparations in case of problems.
Hilary Shelton, director of the National Association for the Advancement of Coloured People's (NAACP) Washington bureau, said there could be a repeat of problems witnessed in some black inner cities in 2004, where voters waited for up to eight hours to cast their ballots.
In response to the expected high turnout among racial and ethnic minority voters, intense interest in the election and online rumours about unrest, the NAACP has written to election officials in every state asking them to try to prevent any problems that could lead to voters being "stymied" or "disenfranchised" such as too few voting machines or staff.
Meanwhile, in a blog posting entitled 'A McCain "Win" Will Be Theft, Resistance Is Planned', David Swanson, Washington director of Democrats.com and a board member of Progressive Democrats of America, writes: "If your television declares John McCain the president elect on the evening of November 4th, your television will be lying.
"You should immediately pick up your pre-packed bags and head straight to the White House in Washington, DC, which we will surround and shut down until this attempt at a third illegitimate presidency is reversed.
"We may be there for days or weeks or months. But we must be there. We must be there by the millions. We must show each other, and the nation, and the world that we have had enough, that we will not stand for one more stolen election, that we will not give in to fear, lies, theft, and intimidation."
[ source : ©The Daily Telegraph, London ]