The campaign of Democratic presidential nominee Sen. Barack Obama (Ill.) Monday announced it has received the backing of the National Association of Police Organizations.

In a telephone news conference with NAPO President Tom Nee, Democratic vice presidential nominee Sen. Joseph Biden (Del.) thanked NAPO for the nod and pledged an initiative to put another 50,000 police officers on the streets. Biden took no questions from reporters.

NAPO represents 238,000 sworn law enforcement officers.

Obama will speak early this afternoon in Green Bay, Wis., delivering what the campaign describes as a “major speech” outlining how he will “reform the greed and excesses of Washington.”

The campaign of Republican presidential candidate Sen. John McCain of Arizona released a new ad Monday titled “Chicago Machine,” which describes what the campaign says are some of the unsavory characters surrounding Obama in Chicago.

The Obama campaign released its own spot asserting that McCain continues to press for deregulation — in this case of the health care system — even amid the current problems on Wall Street.