By Yael T. Abouhalkah, Kansas City Star Editorial Page columnist

Barely three months ago, gasoline cost $4 a gallon in Kansas City. Promoters of light rail were ecstatic: They could campaign on the need to build light rail to avoid costly fillups at the pump.

Not any more.

Gas is now selling for around $1.80 a gallon. The pro-light rail crowd has taken to warning Kansas Citians that the price could go back up again.

Sure, it could. But that's not the landscape of Election Day. And that could -- unfortunately -- hurt light rail's chance of passing today.

Opponents have hammered away for weeks at the three-eighths-cent sales-tax increase needed to pay for light rail.

And they point out that City Hall hasn't told people exactly where the light-rail line would go.

Meanwhile -- with the "high cost of gasoline" argument gone -- promoters are warning that KC will fall behind other cities if it does not build a system.

So what's going to happen?

Light rail would help concentrate where development goes in the city, especially in the urban core.

That's a winning reason to vote for light rail today -- even if gasoline costs have plummeted in recent weeks.