DENVER -- When the general election campaign began in earnest last spring, Colorado was among the swing states that looked most promising for President Obama.As his strategists worried quietly about keeping blue-collar whites in places like Ohio and Iowa in his column, they took comfort from demographic shifts over the years that have put traditionally Republican-leaning Colorado in play.But while both sides agree that Obama has a slight edge over Mitt Romney in this state where the two men will hold their first debate Wednesday night, Colorado appears -- for now, at least -- to be more...

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