The president's defenders have claimed he either misspoke last week at a Roanoke, Va., campaign event or that what he said is true. Both defenses have merit. Obama surely didn't mean to say something that politically idiotic so plainly. And it's true that no man's accomplishments are entirely his own. We're all indebted to others, and we all rely on government to provide some basic things. Only the straw-men conservatives of Obama's imagination yearn for an America with no roads and bridges.