Rep. Cory GardnerCory GardnerMcConnell huddles with GOP rep to discuss possible ND Senate opening GOP senator: Congress will ‘undo the damage’ from Obama Senate GOP to Obama: Stop issuing new rules MORE (R-Colo.) starts his Senate bid in a dead heat with Sen. Mark UdallMark UdallGardner's chief of staff tapped for Senate GOP campaign director The untold stories of the 2016 battle for the Senate Colorado GOP Senate race to unseat Dem incumbent is wide open MORE (D-Colo.), according to one of the first public polls released since Gardner jumped into the race.

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Udall leads Gardner by 42 percent-40 percent, a statistical tie, in a newly released automated poll from the Democratic firm Public Policy Polling. Udall's approval rating is at 41 percent, with 40 percent disapproving.

The senator's narrow lead appears to be driven mostly by President Obama's unpopularity in a state he won twice. Obama's approval rating is at 43 percent with 53 percent disapproving.

Gardner jumped into the race in late February after earlier deciding not to run, a coup for Senate Republicans and a big upgrade over a weak field of candidates. The top three GOP candidates then in the race have since dropped out.

This is the second poll of the race since Gardner announced his candidacy. The conservative Rasmussen Reports found a similar result earlier this month, with Udall leading Gardner by 42 percent-41 percent.

PPP surveyed 568 registered voters from March 13-16. The automated poll's margin of error is plus or minus 4.1 percent.