 Indeed, all 42 Republican senators joined in saying that, until the tax dispute was resolved, they would filibuster to prevent consideration of any other legislation, except for bills to fund the U.S. government.The Middle Class Tax Relief Act of 2010 originated in the Democratic caucus within the House in early December 2010, and proposed to extend the Bush tax cuts for "middle incomes", meaning those earning under $250,000 for joint filers (and for singles, those earning under $200,000).It would restore the previous, higher rates for those "high income" people above that mark.