Barack Obama reportedly got a much-needed boost from one of the last uncommitted Democratic super delegates Sunday, following two days of pointed attacks from his competitors.

Democratic National Committee member Nancy Larson told the Associated Press Sunday that she has decided to throw her support behind Obama.

Larson says Obama will bring new people into the political process and has the best chance of beating presumptive Republican nominee John McCain for the White House.

With the Keystone State's primary a little more than a week away, rival Democratic candidate Hillary Clinton spent Sunday afternoon knocking on doors in her father's childhood hometown of Scranton. Her staff is hoping the day will help emphasize her middle-class roots.

Clinton continues to cast Obama as an elitist following his comments that working-class voters are "bitter" about economic conditions. Obama has since apologized for his choice of words.

McCain also criticized Obama for the remarks. The Arizona senator will be campaigning in Pittsburgh Monday.