Obama urges Americans not to give up on him

Barack Obama urged wavering supporters not to give up on their dreams of change  or on him as he accepted the Democratic Party’s nomination for president in what promises to be a tough race against Republican Mitt Romney.Obama and Romney plunge into 60-day sprint to Election Day as incumbent pleads for patience. Obama and Romney were shadowing each other Friday in New Hampshire and Iowa, improbable battleground states in the too-close-to-call race. The campaigning was sure to be dominated by a new report from the Labor Department on the nation's jobless.