Steve DeBrum wants Manteca to have a larger municipal rainy day fund to guard against future economic downturns plus bring in new businesses and head-of-household jobs.And he believes the best way he can help make that happen is if he gets elected mayor.DeBrum, 66, officially announced his candidacy to replace Willie Weatherford as mayor. Weatherford, who will have served 12 years when his term ends in November 2014, has indicated he’s not seeking another turn.And to make that clear, he’s endorsed DeBrum for mayor as have the rest of the current City Council members. DeBrum has also collected the endorsement of all five San Joaquin County Board of Supervisors members.DeBrum’s 2014 mayoral campaign launch was attended by more than 150 people Wednesday evening at Chez Shari at the Manteca Golf Course clubhouse.