WASHINGTON (AP) — Former Pennsylvania Gov. Tom Ridge says he’s not going to challenge Sen. Arlen Specter next year. Ridge is a moderate Republican who was the nation’s first homeland security chief. He said in a statement Thursday that his party is facing challenges and he will work with the GOP, but he will not seek the nomination. A Quinnipiac University poll this week showed Specter and Ridge running about even in a hypothetical general-election race. Party officials have said he was considering a run. Former Republican Rep. Pat Toomey has announced his candidacy for the Senate. Specter recently split with the Republican Party after four decades to become a Democrat. Earlier Thursday, Democratic Rep. Joe Sestak says he’s considering running.