California Democratic Rep. Doris Matsui advanced to the November ballot on Friday after facing a reelection challenge from a younger Democrat. Matsui, 81, has been in Congress since she replaced her late husband, former Rep. Bob Matsui, in the Sacramento-based seat in 2005. She faced a primary challenge from fellow Democrat Mai Vang, a member of the Sacramento City Council, and is one of several older Democrats challenged by younger insurgents this year. The second slot on the general election