The U.S. Chamber of Commerce is expected to score Friday’s vote on energy and climate change legislation, a source familiar with a forthcoming letter from the group confirmed on Thursday evening.The chamber’s decision to make the cap and trade bill a “key vote” when it grades lawmakers’ performance comes hours after the National Association of Manufacturers issued a similar letter. The National Federation of Independent Business and the National Association of Wholesaler-Distributors told its members on Wednesday that they would “key vote” the bill.The House on Friday is expected to vote on a cap-and-trade bill that will set pollution levels and create a private marketplace for the sale of offsets.