The Democratic hopeful has kept his distance from some of Bloomberg's policies but seems eager to embrace the current mayor's worldly outlook.
A few months after the marathon bombing, Ed Davis talks about civil liberties with more nuance than Ray Kelly.
The New York mayoral candidates come at the question from different sides.
"You're going to have accidents," says New York Police Commissioner Ray Kelly.
Brutal honesty from New York City's planning director.
London's Edward Lister says building basic infrastructure is more important than chasing new technology.
Be wary of self-selection bias when measuring engagement with digital platforms, a New York City official warns.
Lessons from the Great Flood of 1993.
Tech enthusiasts argue that the rise of mobile will create more face-to-face relationships.
It's a cost-effective, high-return option, says Chicago's transportation commissioner.
Washington's dysfunction gives them a chance to talk up their operational prowess.
And counting all of the people (and jobs) who have supposedly moved there.
The thin line between quaint and claustrophobic.
In many places in the U.S., the population is getting older and younger at the same time. And that has big implications for public health.
So why are law enforcement agencies refusing to use it?
He wanted the way he ran his city to become a model for mayors everywhere. But can that idea persist once he's out of office?
Untangling the theory that local ideas can fix global problems.
We're getting ready to launch a new series on city-level experimentation around the world, and we need your help.