Only his most sycophantic admirers might compare Pennsylvania Sen. Arlen Specter with Winston Churchill, but the two do have something in common. Both had long and turbulent political careers, and both switched parties twice.

Churchill crossed aisles from the Conservatives to the Liberals in 1904 and from the Liberals to the Conservatives in 1924. Specter switched to the Republican Party in 1966 after he was elected district attorney of Philadelphia County, and on Tuesday he returned t ...

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