Last time I checked, our allies in this new Gulf War, Great Britain, were led by a left-of-center Labor prime minister named Tony Blair. I also believe that one of our biggest critics, France, is led by a conservative, Jacques Chirac. There's nothing inherently "pacifist" in being a liberal.
Their are a few past Presidents that were considered "liberals" that didn't hesitate using American force--Truman, JFK, and LBJ. The fiction of the dovish liberal doesn't match the reality.
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"What would Jesus drive?"
Duh. A truck -- Jesus was a carpenter.