The Livingston Democrat plans to run for the 5th Senate District seat established by the new political maps approved this week by the independent Citizens Redistricting Commission.
Galgiani is serving her third and final term representing the current 17th Assembly District, which includes Merced County and parts of San Joaquin and Stanislaus counties.
Galgiani said in a statement that the new Senate seat includes "significant" portions of her Assembly district and "presents an opportunity to continue to work on the vital issues I've spent the last several years working on in the Assembly."
"I am no stranger to the serious issues facing this region," she added.
Democrats hold a four-point voter registration edge over Republicans in the new swing district. Sen. Tom Berryhill, R-Oakdale, is also considered a possible candidate for the seat in 2012, though his current term is not up until 2014.
Galgiani had previously announced plans to run for secretary of state in 2014, but her campaign spokeswoman said she is entirely focused right now on running for the Senate in 2012.
PHOTO CREDIT: Cathleen Galgiani, D-Stockton, casts her vote on the budget cuts portion of the Democratic budget plan during the Assembly floor session, Tuesday Dec. 16, 2008. Brian Baer, Sacramento Bee.