David Frum tells us that "[w]ar is a great clarifier" because it "forces people to choose sides." It certainly does. For example, it forced us to team up with Joe Stalin in 1941. War forced the U.S. to side with Saddam Hussein in the 1980s and the Saudi royal family in the 1990s. Let's not forget that great clarifying moment when the Cold War forced us to fund Osama bin Laden in Afghanistan.In the same way, our war against Iraq created political alliances domestically that may have been unnatural, and which now may be falling apart. Specifically, some moderate-to-liberal hawks...