WASHINGTON – On its face, the House vote late Thursday to approve a spending bill that included an unrelated provision written by Citigroup was a big legislative victory for the bank and its fellow Wall Street behemoths.

Yet it’s also a victory that may soon come to haunt the largest institutions.

What they won was the repeal of a Dodd-Frank Act provision that requires them to push out a portion of their derivatives business into subsidiaries. Big banks fought against its inclusion in the 2010 financial reform law and have been steadily fighting to repeal it ever since. The spending bill is expected to pass the Senate in the coming days.

But in finally getting what they wanted, big banks also thrust themselves back into the limelight in the worst possible way, simultaneously reminding the public of their role in causing the financial crisis and in their continuing influence over…