I personally walked the halls of Congress as part of the FDX Legislative Affairs to argue against the 20%/20k cap two years ago as budget cuts looked at all options. It works against small business owners, and it works against high paid union salaried employees too. Fighting that we had support on both sides of the aisle.
Not trying to be infomercial here, but the PAC does a lot of work. Ready up on the websites and you will see some of the issues that go on. The battle is sometimes on the horizon, not just right down the street. A cap on that retirement would really hurt a lot of folks trying to do the "right" thing by saving and investing for their retirement. Erskin-Bowles wanted the cap...
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http://www.irs.gov/uac/2013-Pension-Plan-Limitations