Just weeks before the midterm elections, the Trump administration announced details of tax breaks designed to help spur investment in economically distressed neighborhoods.

But while investors and real estate developers can expect to see immediate tax benefits from the new rules, it won't be clear for a while how effective the program will be in helping voters in the neighborhoods targeted for tax breaks.

The new program targeting so-called "opportunity zones" was included in the $1.5 trillion tax overhaul enacted late last year. Republicans, who are defending majorities in the House and Senate this November, had hoped to stake their campaign messaging to the tax cuts. But the measure failed to resonate with voters on a large scale.