WASHINGTON — Voters in the nation’s capital are all but certain to approve a charter amendment on Tuesday that would grant the city more control over its municipal budget.

In theory, the amendment would take effect unless Congress passes a disapproval resolution and President Barack Obama signs it. But both the White House and Senate Democrats have shown strong support for greater independence for the district, so that is highly unlikely.

Delegate Eleanor Holmes Norton, a Democrat who represents the District of Columbia in Congress says it’s unclear what will happen if the referendum passes.

Some fear the amendment will backfire or that it won’t get the district any closer to its long-stated goal of spending local tax dollars without congressional approval.

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