WASHINGTON — The presidential race has been a nightmare for bankers, dominated on one side by an unpredictable billionaire businessman and the other by a self-avowed socialist who has called for breaking up the big banks and strict limits on interest rates and ATM fees.

But the results from the Iowa caucuses on Monday have shaken up the race, giving establishment candidates like Hillary Clinton a much-needed (though incredibly narrow) victory and Sen. Marco Rubio, R-Fla., an unexpectedly strong third-place finish.

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