According to news reports, the supercommittee is considering a deal to extend the Bush tax cuts while raising revenue by eliminating tax loopholes. Why wouldn't one of six Democrats rush to embrace such a proposal? Maybe they don't want to compromise. Maybe they don't want to reform spending on entitlements.
Democrats have set up this fiction -- that they can fix the deficit simply by going after waste and rich people -- when they know that real reform requires big changes in Medicare and small (but real) changes in Social Security.
AARP has been running advocacy ads that warn Washington politicians, "Before you even think about cutting my Medicare and Social Security benefits," think about the 50 million seniors who vote. No compromise there, just 50 million reasons to fail.