How bad can the civil war get? We may find out Tuesday in Delaware. Mike Castle should have walked to the GOP nomination — that is, until Sarah Palin and her merry Tea Party men decided to back Christine O’Donnell. To put this into perspective, Castle was all but a lock to win: a moderate Republican who would have won if not for the fact that by Tea Party standards Castle is a Das Kapital-reading, want-to-take-your-guns-away-and-tax-you-to-the-nines liberal. It almost makes you laugh, as a Democrat, how the GOP is engaged in a never-ending, brutal civil war over ideological purity. From...