Mitt Romney, the Republican front-runner, might be easier to elect than to nominate. The reverse might be true of Perry. Is he a wine that will not travel? To win the White House, a Republican must be competitive among independents, including women, in places like Montgomery County outside Philadelphia. Perry — his accent, his Westerner’s body language, those boots — is proof that, in spite of the culture’s homogenizing forces, regional differences remain remarkably durable. But so, too, do regional antipathies, some of which have intensified as voters have become more polarized, partly because of a Texas governor who became president.