Schumer welcomes McCormick as a new senator, while Bob Casey refuses to concede the PA Senate race.

Despite The Associated Press and other media outlets declaring Republican Dave McCormick the winner of the race, Democrat Sen. Bob Casey Jr. remains unwilling to concede.

In a new video message, Casey stated that the democratic process will be completed once all the votes are counted. Currently, McCormick is leading Casey by 34,561 votes, according to Pennsylvania's election results website.

Across Pennsylvania, nearly 7 million people voted in a fair and free election. Our county election officials will count those votes, as they do in every election, said Casey.

"Pennsylvania is where the American democratic process originated, and it will continue to unfold. I want to express my gratitude to the election workers throughout our state who have been tirelessly working over the weekend. Their efforts will ensure that the voices of Pennsylvanians are heard."

At 4:09 p.m. on Thursday, McCormick was leading by more than 30,000 votes, but the AP declared the race in favor of Casey after estimating that there were still 91,000 votes outstanding, which were not enough to close the gap.

The McCormick campaign did not immediately respond to a request for comment.

On Friday, McCormick declared victory in Pittsburgh and thanked Casey and his family for their decades of service to the commonwealth.

McCormick stated that Casey and his father, a pro-life moderate governor who served in the 1980s and 1990s, deserve respect for "serving with honor." The younger Casey has been in office for three terms, having defeated conservative Senator Rick Santorum in 2006.

McCormick began by expressing his absolute gratitude: "I am grateful to be standing here in this beautiful day in a city that has meant so much to my family. My dad went to college at Pitt, and we had some of the most formative years of our lives here. Three of our girls were born here."

This week, McCormick will attend new senator orientation in the nation's capital, despite initial opposition from Senate Majority Leader Chuck Schumer, D-N.Y., who initially said McCormick was not welcome due to there still being votes left to be counted. However, Schumer eventually relented and invited McCormick to participate.

Planet Chronicle Digital's Danielle Wallace and Kelley Phares contributed to this report.