[cnn-photo-caption image= http://i.l.cnn.net/cnn/2008/images/02/08/art.wash.gi.jpg caption=" Christine Gregoire has endorsed Obama."]
(CNN) - Barack Obama has won the backing of Washington Gov. Christine Gregoire, one day before that state is set to hold its Democratic caucuses.
The Washington Democrat, who won the office in 2004 after a hand recount favored her by only 129 votes, said she found it difficult to choose between Obama and Hillary Clinton, but was ultimately drawn to the Illinois senator's charisma and leadership skills.
Gregoire is slated to join Obama at a campaign rally in Seattle later Friday. Clinton is also in the state, campaigning 30 miles south in Tacoma and then later in Spokane.
Washington is set to allocate its 78 delegates through caucuses - a format that has favored Obama to date this elections season.
Washington Sens. Maria Cantwell and Patty Murray have endorsed Clinton's White House bid.
- CNN Producer Alexander Mooney