Salon: While we wait for cellulosic ethanol to ramp up to commercial-scale, the corn-based ethanol industry continues to hang on with a little help from Washington — President Barack Obama indicated over the weekend that import tariffs on Brazilian sugarcane ethanol won`t be ending anytime soon. The issue came up after a meeting between Obama and the president of Brazil at the White House. Calling it a "source of tension" between the two countries, Obama said at a press conference, "It`s …