by: Jonathan Weisman | New York Times

WASHINGTON — As a member of the “Gang of Six,” Senator Mike Crapo of Idaho has emerged as something of a hero among advocates of bipartisanship, one of three conservative Republicans working with three Democrats to cut the deficit by closing loopholes that allow businesses and households to avoid paying taxes.

Yet earlier this year, the senator made sure that a $3 billion loophole — protecting “black liquor,” an alcoholic sludge used as fuel in timber mills and factories — remained open in the negotiations over the highway bill that President Obama signed this month.