Well, if people believe this 'war on terror' imperial war is the first one conducted by the US government, then we have very poorly informed voters who are a sucker for anything.
Add those (Phillipines, Korea, Vietnam, Afghanistan, Iraq) to the covert wars in Central and South America using proxy paramilitaries and government forces alongside our CIA (El Salvador, Nicaragua, Guatemala, Columbia, Chile, Panama, Haiti, Argentina, Cuba), and you have quite a long list of imperial US military adventurism.
Anyone who believes Barack Obama will 'break the mold' of US imperial presidents isn't paying attention.