Interior Secretary Ken Salazar is back in his home state Sunday to campaign for Rep. Betsy Markey (D-Colo.), a former employee of Salazar’s who is also one of the more vulnerable Democratic incumbents in this midterm election.

Salazar was scheduled to participate in an event at a park in Greeley, Colo. “Rain or shine, my rally with Ken Salazar will go on!” Markey tweeted Sunday. It was scheduled from 11:30 a.m. to 1 p.m. MST.

Salazar visited the same park in Markey's district two years ago to campaign for her before she unseated three-term Republican Rep. Marilyn Musgrave. Salazar in August also campaigned for another embattled Democratic incumbent from Colorado up for reelection, Sen. Michael BennetMichael Farrand BennetTop Democrat pushes for tying unemployment insurance to economic conditions 50-50 Senate opens the door to solutions outlasting Trump's moment of violence Build trust in vaccines by investing in community workers MORE.

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Markey was a district representative for Salazar when he was a Democratic U.S. senator from Colorado.

She is facing a stiff challenge from Republican Cory GardnerCory GardnerOvernight Defense: Joint Chiefs denounce Capitol attack | Contractors halt donations after siege | 'QAnon Shaman' at Capitol is Navy vet Lobbying world Senate swears-in six new lawmakers as 117th Congress convenes MORE, the minority whip in the Colorado General Assembly.

According to a recent poll commissioned by The Hill, Gardner led Markey by only 3 points in the Republican-leaning district — within the poll’s margin of error — with 14 percent of likely voters undecided.