In a preview of his highly anticipated acceptance speech tonight at the Democratic National Convention, presidential hopeful Sen. Barack Obama (Ill.) plans to retell his life story, pummel the past eight years of George W. Bush’s presidency and outline specific goals for retooling the American economy and ending the war in Iraq.

Obama will deliver his prime-time remarks before a crowd of about 75,000 at Denver’s Invesco Field at Mile High as he formally accepts the Democratic Party’s nomination for president. The scene is expected to be as much a political rally as rock concert with the biggest names in politics and music taking to the stage.

Yet despite the atmosphere of near-unprecedented pomp, Obama will outline how he plans to effectuate change if elected president in November. The Illinois Senator will pledge to cut taxes on 95 percent of working families, end America’s dependence on foreign oil in 10 years by investing in fuel efficient cars, natural gas and clean coal, while pledging to serve as a strong commander in chief who will defend the country when necessary but end the war in Iraq.

“We are the party of Roosevelt. We are the party of Kennedy. So don’t tell me that Democrats won’t defend this country,” Obama is expected to tell the crowd. “Don’t tell me that Democrats won’t keep us safe. The Bush-McCain foreign policy has squandered the legacy that generations of Americans — Democrats and Republicans — have built, and we are to restore that legacy.”

Obama also plans to use the biggest speech of his career to try to put a dent in the upcoming Republican National Convention next week during which Sen. John McCain (Ariz.) will formally become his party’s presidential nominee.

“This moment — this election — is our chance to keep, in the 21st century, the American promise alive,” Obama is expected to say. “Because next week, in Minnesota, the same party that brought you two terms of George Bush and Dick Cheney will ask this country for a third. And we are here because we love this country too much to let the next four years look just like the last eight. On Nov. 4, we must stand up and say: Eight is enough.”