Vowing to make a clean break with the "broken politics" and "failed policies" of President George W Bush, Barack Obama accepted the Democratic Party nomination as US Presidential candidate, and said he would undo the 8 years of Republican reign.

In a stirring speech before an estimated 80,000 plus crowd at the Denver Democratic National Convention, the 47-year old Afro-American Senator from Illinois hammered away at the Bush government's domestic and foreign policies, taking potshots at the Republican nominee John McCain for endorsing them.

"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," Senator Obama said to booing from the crowd.

"And we are here because we love this country too much to let the next four years look just like the last eight. On November 4th, we must stand up and say: 8 is enough," he said.

Obama, who was yesterday nominated by the party as its presidential candidate, went on to rebuke his rival McCain's stand on the Iraq war, saying his demand for a timeframe to remove troops from Iraq has been vindicated as it has now been echoed by the Iraqi and even the Bush administration.

"Even after we learned that Iraq has USD 79 billion in surplus while we are in deficit, John McCain stands alone in his stubborn refusal to end a misguided war," Senator Obama said.