CHARLOTTE, N.C. — Although the idea of breaking up the big banks — championed by a diverse group of economists, pundits, regulators and ex-bankers — has gained momentum in recent months, the leadership of both political parties has so far declined to embrace such a suggestion.

Yet in a series of interviews with delegates at both the Republican and Democratic national conventions, it appears the idea enjoys broad bipartisan support, suggesting there is an opportunity for a populist politician to make a cross-party appeal for a break-up.

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