The latest poll conducted by the Public Policy Institute of California shows current state Attorney General Kamala Harris leads in her race over congresswoman Loretta Sanchez, 32% to 25%. Harris’ lead shrank form a July poll in which she had an 18 point advantage (in May that was only 8 points).

However, 24% of survey respondents said they will choose to sit this one out. Both Harris and Sanchez are Democrats. “This is an unusual statewide race between two candidates of the same party,” Mark Baldassare, PPIC president and CEO, said. “Kamala Harris continues to lead, with about one in three supporting her US Senate candidacy. At the same time, many Republicans and independents say they’re still undecided or won’t vote.”

Read the full poll results for the US Senate here.