WASHINGTON — When the Senate Banking Committee meets Wednesday to question Jamie Dimon about the massive trading loss at JPMorgan Chase (JPM), its five most senior members will have one thing in common: a heavy reliance on campaign contributions from the politically connected New York bank.

JPMorgan is Banking Committee Chairman Tim Johnson's second-largest contributor over the last two-plus decades, according to the Center for Responsive Politics, which analyzes campaign giving from companies' employees and their political action committees since 1989. The same is true for the committee's top Republican, Sen. Richard Shelby, and its second-ranking Democrat, Sen. Jack Reed.

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