For many banks, it's the most nettlesome part of the Dodd-Frank Act. And yet, even in this new era of regulatory skepticism in Washington, repealing caps on swipe fees may prove to be an impossible mission for industry lobbyists.

Bankers and others close to the industry are generally optimistic about the prospects for a major rollback of regulations in the upcoming Congress. But they are adopting a much more cautious posture regarding the Durbin amendment, which caps the interchange fees that many banks can charge when their customers use debit cards, and was named after Sen. Richard Durbin, D-Ill.

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