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Washington (CNN) -- House Budget Chairman Paul Ryan, R-Wisconsin, will unveil a highly anticipated 2012 Republican budget next week that proposes dramatic changes to political lightning rods: entitlements. The plan, to be released Tuesday, calls for a controversial overhaul of Medicare, the health care program for seniors, and imposes deep cuts in Medicaid, which provides health benefits to low-income Americans, according to House Republican sources with knowledge of the proposal. Starting 10 years from now, in 2021, Americans would no longer enroll in the Medicare program, but instead receive vouchers for private insurance, according to the GOP sources, who stressed anyone 55 or older now would not be affected by the change.

"By the time my kids are my age, just those three programs -- Social Security, Medicaid and
Medicare --will consume all federal revenues.