Sometimes irascible but ever the embodiment of political pragmatism, former Sen. Arlen Specter of Pennsylvania lost his battle with cancer Sunday. A Democrat-turned-Republican-returned-Democrat, he represented his state in the Senate longer than any other Keystone State lawmaker until he lost a primary race in 2010. 

A look at Specter's profile on Sunlight's Capitol Words, which tracks lawmakers' speeches on the floor of Congress, reveals a rarity in contemporary politics: a politician who moved easily across party lines. His most oft-uttered word was the name of another senator, Tom Harkin of Iowa, who for most of Specter's 30-year ...