Colorado Senate race: Latest poll shows narrow lead for Gardner over Udall

The latest of several recent surveys of Colorado voters on the U.S. Senate race shows a slim lead for challenger Cory Gardner over incumbent Mark Udall - but that lead is within the survey's margin of error. The automated survey of 652 likely Colorado voters, released Thursday by Public Policy Polling , shows Republican Gardner supported by 47 percent and Democrat Udall by 45 percent, with 7 percent unsure.

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