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With 21 Democratic U.S. Senate seats in play this November, Colorado in a single day moved from a relatively safe seat for incumbent Sen. Mark Udall, to one of the more closely watched competitive races in the country.
With 21 Democratic U.S. Senate seats in play this November, Colorado in a single day moved from a relatively safe seat for incumbent Sen. Mark Udall, to one of the more closely watched competitive races in the country.