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DENVER -- Treasurer Walker Stapleton fended off attacks from his Democratic challenger, former Congresswoman Betsy Markey, during a combative debate Sunday morning on #COpolitics: From The Source.

Markey, who served one term in Congress, alleged that Stapleton hasn't taken his responsibilities as treasurer seriously enough, pointing to key card records from the State Capitol showing that the Republican is in the office far less than his deputy, Brett Johnson.

Stapleton, who is seeking a second term overseeing the state's $9 billion in finances, dismissed Markey's attacks as "petty stuff" and put her on the spot with questions about public finance.

"What's a yield curve?" Stapleton asked Markey at one point.

Markey never answered that question, leading Stapleton to question her knowledge of public finance and qualifications for the job.

The two also tangled over the Public Employees Retirement Association (PERA), which Stapleton has made his signature issue in trying to shore up the retirement fund and its $26 million in unfunded liabilities.