Millions of white men who voted for Barack Obama are walking away from the Democratic Party, and it appears increasingly likely that they'll take the midterms elections in November with them. Their departure could well lead to a GOP landslide on a scale not seen since 1994. For more than three decades before the 2008 election, no Democratic president had won a majority of the electorate. In part, that was because of low support -- never more than 38 percent -- among white male voters. Things changed with Obama, who not only won a majority of all people voting, but...