San Diego voters last week overwhelmingly approved big changes to the city's pension system that could result in nearly $1 billion in savings over the next 30 years, according to the city's official estimates.

Those changes include a switch from defined benefit to defined contribution plans for most employees, and a five-year freeze on pay raises for the purposes of calculating pension benefits.

Although the vote is over, the legal challenges are not, and the savings are by no means a done deal.

San Diego Mayor Jerry Sanders and San Diego Municipal Employees Association General Manager Mike Zucchet discusses the issue with Governing.