The 10Best website, a division of USA Today Travel, is running a readers' choice contest to determine the food that most defines a city or region in the United States.

There are 20 food-place combos vying for the Best Iconic American Food title.

So, is it San Francisco and its cioppino, Philadelphia and its cheese steak or Charleston, S.C., and its shrimp and grits. Or is it Baltimore and its crabs?

The contest launched on Monday and runs through July 24. You can vote for one place, once a day.

On the second day of voting, Baltimore and its crab cakes were in second place, behind Wisconsin and its cheese curds.