Bill Clinton actually said...
In practice, H.J.Res. 37 would have the absurd result that special interest tax loopholes could be enacted by a simple majority, but a two-thirds super-majority would be required to close such loopholes.
Context
Statement of Administration Policy: H.J.Res. 37 - Constitutional Amendment Requiring Two-Thirds Votes on Certain Tax Measures
04/14/1999