One of Obama's closing points is that McCain would carry out George Bush's policies if elected, saying the Arizona senator has "ridden shotgun" with the president on economic policy.

CNN: Palin costing McCain, poll suggests

"John McCain's ridden shotgun as George Bush has driven our economy toward a cliff, and now he wants to take the wheel and step on the gas, " Obama said at a rainy rally in Chester, Pennsylvania.

CNN: Obama takes swipe at McCain adviser's health care comment