By Daniel Wallis DENVER (Reuters) - What was once a "fly-over" Senate race in Colorado has become one of the nation's most closely watched contests, with a young Republican congressman who is leaving a safe seat in the U.S. House fiercely attacking Democratic incumbent Mark Udall. As mail-in ballots headed to post boxes across the state this week, Udall's path to re-election appeared steeper after he failed to win the endorsement of the state's flagship newspaper. Polls show a race that's too close to call. "It's a toss-up. ... There's no one single issue that defines the race," said Floyd Ciruli, a Denver-based independent pollster, adding that...
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