The last couple of months have been springtime in paradise for Republicans: the loveliest of all possible seasons. They have been watching two Democratic presidential candidates in an endless battle to destroy each other -- a process that does not appear to enhance the chance that the eventual nominee will win in November. A recent Gallup poll shows John McCain leading both Barack Obama and Hillary Clinton in a head-to-head matchup. All this before Republicans even begin publicizing the worst that can be said about either of two candidates whose alleged defects provide a supremely target-rich environment. But it's easy...