By ANDREW TAYLORWASHINGTON (AP) â¿¿ Across-the-board spending cuts all but certain, Republicans and Democrats in the Senate are staging a politically charged showdown designed to avoid public blame for any resulting inconvenience or disruption in government services. The two parties drafted alternative measures to replace the cuts, but officials conceded in advance the rival measures were doomed. At the White House, President Barack Obama invited congressional leaders to discuss the issue with him on Friday â¿¿ deadline day for averting the cuts, which would slash $85 billion from the military and domestic programs alike. Democrats controlling the Senate are pushing a $110 billion plan that would block the cuts through the end of the year. They would carve 5 percent from domestic agencies and 8 percent from the Pentagon but would leave several major programs alone, including Social Security, Medicaid and food stamps, while limiting the cuts to Medicare to a 2 percent reduction to health care providers like doctors and hospitals. The Democratic plan proposes $27.5 billion in future-year cuts in defense spending, elimination of a program of direct payments to certain farmers, and a minimum tax rate on income exceeding $1 million as the main elements of an alternative to the immediate and bruising automatic cuts, known in Washington-speak as a "sequester." Republicans were sure to kill the Democratic alternative with a filibuster. They were poised to offer an alternative of their own that would give Obama the authority to propose a rewrite to the 2013 budget to redistribute the cuts. Obama would be unable to cut defense by more than the $43 billion reduction that the Pentagon faces and would be unable to raise taxes to undo the cuts. The idea is that money could be transferred from lower-priority accounts to accounts funding air traffic control or meat inspection. The White House says such moves would offer only slight relief, but they could take pressure off Congress to address the sequester.