Apr 21, 2008 - As the Pennsylvania primary approaches, Sen. Barack Obama has tapped into an unmatched wealth of financial resources in an effort to deliver the electoral knockout punch, outspending Sen. Hillary Clinton by a margin of roughly 2.3-to-1 on ad buys alone.

According to figures provided by a campaign source, Obama has spent $11,246,573 in media purchases in Pennsylvania, almost 3 dollars ($2.78) for…