WASHINGTON — At a meeting with Democratic congressional leadership Saturday afternoon, President Obama said he would oppose any compromise deal on the expiring Bush tax cuts if it lacked help for the unemployed and other provisions designed to aid the middle class. Speaking with House Speaker Nancy Pelosi (D-Cali.) and Senate Majority Leader Harry Reid (D-Nev.) shortly after the Senate failed to pass his preferred tax cut package proposal, Obama drew sharp lines in the sand with respect to ongoing negotiations.