Denver's Mayoral Race Takes a Negative Turn in Final Days.

The Denver mayoral runoff has turned negative in the final stretch, with both candidates taking shots at each other. Outside groups have spent heavily, with fundraising and spending by the two candidates remaining relatively even. Super PACs supporting the candidates have spent millions, dwarfing candidate spending. Turnout has been low, with voters having until Tuesday to return their ballots. The next mayor will oversee a city government that employs 11,000 people with a $1.6 billion budget.