...and he's proving it by standing up the Oklahoma Republican convention. Romney had committed months ago to be the keynote speaker at this year's convention, to be held on April 14 in Oklahoma City.

But just yesterday, Romney's people notified the state GOP that he would not be coming to speak. When the party contacted the Romney campaign to find out why, so that they could provide some explanation to the delegates, some graceful way out for Romney, the campaign's response was that they had no response.

Barring a family emergency -- not a likely reason for a cancellation 10 days in advance -- there's no good reason for Romney to cancel. He doesn't have legislative or executive responsibilities to fulfill. He's just running for president, and this has been on the calendar for a long time.

The message the cancellation sends is that Mitt Romney will stick to a commitment, but only until something better comes along.

It may be too late to schedule another speaker, but convention organizers are giving it their best.

Wouldn't be exciting -- and symbolic -- if Fred Thompson came to speak, filling the void left by Romney?