The coalition, named BBA Now, as in Balance Budget Amendment Now, plans to officially unveil its three-year plan in September, director of coalitions Kellen Giuda said in an interview. Part of the campaign includes petitioning 2010 congressional candidates, as well as presidential candidates in 2012, to sign a pledge in support of the effort . . . The amendment envisioned by the coalition includes three pillars: ending the annual deficit by requiring a balanced budget, limiting federal spending to no more than 20 percent of the country’s GDP and requiring a two-thirds supermajority vote in Congress to raise taxes ....