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DENVER – President Barack Obama leads Republican Mitt Romney by four points with Colorado voters, according to a poll released Friday.

The live telephone survey of 500 likely Colorado voters, the first poll in this swing state since Congressman Paul Ryan joined the GOP ticket, shows Obama with 48 percent support and Romney with 44  percent.

The four point spread is just within the poll’s 4.4 percent margin of error.

“Clearly, Romney’s choice of Ryan as his running mate has not provided an impact on the Presidential race in Colorado,” said pollster Chris Keating. “But this is a close race that remains just within the margin of error. There is no doubt that the Presidential race in Colorado will depend on voter turnout.”

The survey was conducted earlier this week, on Tuesday and Wednesday, just as the controversy surrounding Missouri GOP senate candidate Todd Akin’s “legitimate rape” comment was dominating the news cycle.

According to the poll, which Keating conducted for OnSight Public Affairs, a Democratic firm that ran Gov. John Hickenlooper’s 2010 campaign, Obama has a 51-44 edge with women voters, a 65-32 edge with Latino voters and, most importantly, a sizable lead with Unaffiliated voters, who favor Obama over Romney by a margin of 50-36.

“As we saw in the 2008 Presidential race, unaffiliated voters in Colorado are often the deciding factor in close races because they represent nearly one-third of voters statewide,” Keating said.