Democrats are trying to frame the midterm elections as a referendum on an unpopular war and an unpopular president. Republicans say this election is really a choice between a mainstream GOP and congressional Democrats who are well to the left of the American electorate. Do the Republicans have a case? Based on the abundantly documented public record, they do. This is especially true on the House side where political gerrymandering has favored election of the most liberal Democrats. Nancy Pelosi's party should be having a very tough time, indeed, selling itself as a mainstream alternative to congressional Republicans. Start with...