Mike Whalen, CEO of Heart of America Group, said he got started with loans from banks that took a chance on an unknown: “It is not an underwriting standard that can be dictated by Dodd-Frank with 55 pages. It’s kind of a gut instinct.”

But John Allison, who built BB&T Corp. into the 12th biggest bank in America, says that “gut instinct” is now illegal.

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Politicians rarely understand this. One who learned it too late was Sen. George McGovern. After he left office, he started a small bed-and-breakfast and hit the regulatory wall he helped create. Later, he wrote, “I wish during the years I was in public office I had this firsthand experience about the difficulties businesspeople face. ... We are choking off business opportunity.”