The city has asked the Colorado congressional delegation to assist in finding ways to recoup the costs, possibly seeking excess cash left over from the two presidential conventions.
Of those debate expenses, nearly $90,000 was in overtime costs and about $400,000 was on-duty costs, said Denver Police Chief Robert White.
The city anticipated the security costs in debate planning and has begun to explore funding options and work with members of the Colorado delegation to offset the costs incurred, according to Amber Miller, spokeswoman for Denver Mayor Michael Hancock.
Police were in charge of the motorcade for candidates, security for hotels, crowd management and other perimeter security.
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(Copyright 2012 The Denver Post)