By the Washington Times

The Republican Main Street Partnership Political Action Committee is airing a new 30-second radio that questions whether Rep. Patrick J. Toomey is a real Republican.

The conservative Mr. Toomey is challenging liberal Sen. Arlen Specter in today's Republican primary. The group said the ad was running in Philadelphia and York during the last 48 hours before polls close.

"Arlen Specter is the true Republican choice in this primary," said PAC advisory board member Rep. Doug Ose, California Republican. "He has served as a loyal Republican in the U.S. Senate for 24 years and has earned the support of President Bush and GOP leaders both in Congress and in Pennsylvania."

The ad says Mr. Specter's challenger has received substantial financial backing from the Club for Growth, which "does not care about the Republican Party."

Mr. Ose said, "The Club routinely rebukes President Bush and the Republican Party. How can Pat Toomey claim to be a true Republican when he is running for the Senate against the White House's will and when his campaign is reaping millions of dollars in benefits from an organization that is constantly bashing the president? A vote against Specter is a vote against the Republican Party."