Mitt Romney's gaffes...

...aren't the problem; it's his policies. From Ezra Klein's blog (my emphasis):

Romney's tax policy, described simply, is to extend the Bush tax cuts and, then on top of that, sharply cut taxes on corporations, the wealthy, and upper-middle class investors, while letting a set of tax breaks that help the poor expire. The result, according to the Tax Policy Center, would be a $69 tax cut for the average individual in the bottom 20 percent and a $164,000 tax cut for the average individual in the top one percent. And Romney would pay for this through unspecified cuts to domestic programs. Since domestic programs mostly go to the poor and seniors, the regressive tax cuts would be regressively financed.