Polling data presented to the Acalanes school board this summer showed over 90 percent support for extending the district’s $189 parcel tax. But Superintendent John Stockton doesn’t consider it a slam dunk.

“I never assume things are always going to fly on their way through,” he told me today.

But neither is the district mounting a major campaign. Stockton said there’s been some “low-key” outreach regarding the tax, which is on the Nov. 3 ballot. A two-thirds majority voting yes would make the yearly assessment permanent.

Stockton said the district won’t spend a lot of money on the campaign, adding that the current tax doesn’t expire until June 2011.