We need a foreign policy debate during this campaign about which wars are worth fighting

Over the next 18 months, you’re going to hear Republican politicians and — barring a Rand Paul upset — the eventual Republican nominee campaigning vigorously against this state of play, and arguing that America should be fighting more to win and less to draw. Napoleon’s maxim, “When you set out to take Vienna, take Vienna,” will be repurposed as a critique of this president and all his many half-fought, un-won wars.

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That critique will have some teeth. Even frozen conflicts cost lives and treasure (and invite blowback), the world has grown more dangerous and chaotic across Obama’s second term, and the sense that American policy makers are constantly playing not to lose is plainly informing the calculations made in Moscow, Tehran and Beijing.

The problem is that Republican hawks have too many wars where they seem intent on turning up the heat, too many Viennas that they want to take at once. There is no sign as yet that the president’s would-be successors have clear strategic priorities; instead, the tendency is to treat every conflict that comes into the headlines, whether it involves Libya or Iran, Syria or Ukraine, AfPak or the Islamic State, as a theater where there’s no substitute for American-led victory.