Why presidents rarely tackle tax reform

President Trump is set to unveil a tax reform agenda today. One of the centerpieces is expected to be his campaign promise to cut the corporate tax rate from 35 percent to 15 percent.  But tax cuts and tax reform are two different things. The last real crack the U.S. took at tax reform was back in 1986, more than three decades ago. Why is tax reform so hard that most administrations simply skip it? 

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