Simply Amazing.

Surrounded by an enormous, adoring crowd, Barack Obama promised a clean break from the "broken politics in Washington and the failed policies of George W. Bush" Thursday night as he embarked on the final lap of his audacious bid to become the nation's first black president.

"America, now is not the time for small plans," the 47-year-old Illinois senator told an estimated 84,000 people packed into Invesco Field, a huge football stadium at the base of the Rocky Mountains.

He vowed to cut taxes for nearly all working-class families, end the war in Iraq and break America's dependence on Mideast oil within a decade. By contrast, he said, "John McCain has voted with President Bush 90 percent of the time," a scathing indictment of his Republican rival _ on health care, education, the economy and more.

Polls indicate a close race between Obama and McCain, the Arizona senator who stands between him and a place in history. On a night 45 years after Martin Luther King Jr. delivered his "I have a Dream Speech," Obama made no overt mention of his own race.

"I realize that I am not the likeliest candidate for this office. I don't fit the typical pedigree" of a presidential candidate was as close as he came to the long-smoldering issue that may well determine the outcome of the election.

Fireworks lit the night sky as Obama accepted the cheers of his supporters. His wife, Michelle, and their daughters Malia and Sasha joined him, and the country music sounds of "Only in America" filled the stadium.

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