Former Congressman Chris Bell publicly backed fiscal conservative Bill King in the Houston mayoral runoff Tuesday, a move that could bolster King's efforts to make inroads with progressive voters.

Bell's endorsement came as a surprise to many political insiders expecting the progressive former mayoral candidate to support King's rival, Democrat Sylvester Turner.

Bell cited King's focus on pension reform, public safety, road repair and flooding as reasons for his endorsement, as well as the businessman's thoughtful approach to policy issues.

"It might come as a surprise to some because of my political persuasion, but it really shouldn't," Bell said alongside King in Meyerland. "Truth be told, we agree much more than we disagree. As far as the major principles of his campaign, we're in complete agreement."

Welcoming Bell's endorsement, King said, "The issues that face the city are not partisan."

Turner finished first in Nov. 3, earning 31 percent of the vote to King's 25 percent. Bell followed in fifth place with 7 percent of the vote, mostly concentrated in progressive District C.

The runoff to determine term-limited Mayor Annise Parker's successor is Dec. 12. Early voting runs from Dec. 2 to Dec. 8.