Climatewire: Indiana’s two U.S. senators are considered critical fence sitters on major climate legislation moving through Congress. But should they be? In interviews last week, Republican Sen. Richard Lugar (Ind.) and his Democratic colleague Evan Bayh (Ind.) expressed serious concerns about a mandatory cap on greenhouse gases, with unease about China, the economy and state utilities prevalent in their minds. Both did not rule out eventually voting for a bill, but each voiced the need for …