The news sets up a three-way race for November.
The Walker campaign said it’s not interested in a “destructive primary.”
The push to allow Anchorage to use its vote-by-mail system in the 2018 elections is the first effort to expand the system.
Gara announced earlier this week that he was considering retiring after 16 years in the Legislature, inviting interested candidates to file.
The Anchorage Democrat would like to have some input in finding a replacement as he considers stepping away after 16 years.
Most expect Eagle River Republican Rep. Lora Reinbold will seek the open seat.
Guttenberg made the announcement to the monthly meeting at the Fairbanks Laborers’ hall, which helped launch his political career.
The move sets up a head-to-head race between Walker (or another Democrat) and the eventual Republican candidate.
Walker’s approval rating collapsed after the PFD veto. Now it’s seven points below his highest ever rating.
There’s additional polling out on the race for governor.