Obama's campaign and a political action committee supporting him have spent more than $8 million on television advertisements in the state, according to Republican officials who track ad buys. Romney and outside groups backing his candidacy have spent more than $4 million.
The NBC/Marist poll found that Obama has advantages with Colorado voters on social issues and national security, while Romney has the advantage on reducing the national debt. The majority of voters in Colorado say the economy is their top issue in the November, but they are evenly split over which candidate would be better at handling the economy.
Colorado's unemployment rate, at 8.1 percent last month, is just below the national average.
Obama's campaign also is seeking to rally support among Colorado's growing numbers of Hispanics and young people, two groups where the president has an edge over Romney. The presumptive GOP nominee sees an opportunity to make up ground in the state's traditionally Republican rural areas.
His campaign also hopes to appeal to middle-class voters in the vast Denver suburbs, who may be unhappy with the economy. However, Obama has an advantage among this group's key segment: suburban women.
Associated Press writer Thomas Beaumont and AP Deputy Director of Polling Jennifer Agiesta contributed to this report.
Follow Julie Pace at http://twitter.com/jpaceDC
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