Here's a great way to visualize former Massachusetts Governor Mitt Romney's inability to inspire Republican primary voters: Imagine the candidate delivering a major speech at a pro football stadium. Now picture that instead of 65,000 cheering supporters, his actual audience is about 1,200 people seated quietly on the field directly in front of him.

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Unfortunately for Mr. Romney, no one needs to imagine that scenario. It's what actually happened today at Detroit's Ford Field. Instead of the major economic address promised by his campaign; the small audience was subjected to the same old policy ideas, quips and nervous laughter we've come to expect whenever Mr. Romney is under pressure.

When asked if he had the best chance of all the GOP contenders to defeat President Barack Obama in November, Governor Romney said, "I not only think I have the best chance, I think I have the only chance." Then came that nervous laughter as he added, "Maybe I'm overstating it a little bit," and then, "I, uh, that's my family leading the applause down here."

In a sad attempt at pandering to the Michigan crowd, Governor Romney then proclaimed that he and his wife drove cars built in Detroit. But in what is sure to be the most quoted line of the day, he listed the various cars they currently own:

"I drive a Mustang and Chevy pickup truck," he said. "Ann drives a couple of Cadillacs, actually."

Even if he didn't mean to, bragging about 2 people owning 4 cars is bound to hit a sour note with so many Americans who are struggling to make the payments on one vehicle. But the only comment from a Romney spokesman on the issue was to explain that Mrs. Romney owns two Cadillac SRXs and keeps one at each of the family's two homes.

That's probably not the takeaway Team Romney was hoping for from today's speech. And it's definitely not the buzz the candidate needs just days before Tuesday’s Michigan primary – a contest that's becoming more of a must-win for him with each passing day.