The photo-finish U.S. Senate race in Pennsylvania was over Thursday afternoon, and Republicans were ecstatic.

By a wafer-thin margin of roughly 30,000 votes out of 6.7 million, David McCormick -- West Point graduate and former hedge fund CEO -- ousted three-term Democrat Sen. Bob Casey.

Their contest is the first time in 30 years a sitting senator from the Keystone State was defeated and the closest Senate contest in the state since popular election of senators began.