The first lady's well-publi cized, expensive vacation in southern Spain last week was a PR gift to her husband's opposition. After all, we're in the middle of a major recession, with many Americans suffering terribly. President Obama himself, in discussing American economic woes with George Stephanopolous in January, said, "Everybody's going to have to [sacrifice]. Everybody's going to have to have some skin in the game." "Sacrifice for thee but not for me" is not a great campaign slogan. Plus, Obama's worst political weakness has been with white-working class voters, who've viewed him with suspicion at least since the 2008...