CORALVILLE, Iowa - Democratic presidential front-runner Hillary Rodham  Clinton said Tuesday the federal minimum wage should be $12 an hour.

Clinton said that figure would roughly match in today’s dollars what the federal minimum wage was in 1968, the time when it was highest in terms of buying power.

“Twelve would give us a good solid increase,” Clinton said.

The national figure is currently $7.25 an hour. Clinton had previously expressed support for a Democratic proposal in the Senate for a $12 federal minimum but had not discussed it at length on the stump.

Localities should be free to mandate higher minimum wages, Clinton said, such as the $15 an hour minimums several cities have adopted or proposed.

Clinton's closest Democratic rival, Vermont Sen. Bernie Sanders, supports a federal minimum of $15.