For the second year in a row the Pentagon has insisted that it doesn't need another engine for its next-generation fighter jet. And again, Senator Edward M. Kennedy and other powerful lawmakers are forcing it to build one anyway. Tucked in the annual defense bill moving through Congress is $480 million to develop a spare engine for the F-35 Joint Strike Fighter even though the Air Force concluded in 2005 that it was redundant -- and two independent review boards agreed. That didn't trump pork-barrel politics. General Electric Aircraft Engines in Lynn is designing the spare engine and says the...