Walters: Mahan’s campaign for California governor will be a voter litmus test

With the not-unexpected entry of San Jose Mayor Matt Mahan, the large field of candidates to succeed Gov. Gavin Newsom is probably complete — and could very well shrink again.

The run-up to this moment has been the oddest gubernatorial election process in modern history with potential candidates serially dropping in and dropping out. Until Mahan’s announcement on Thursday, there were eight other Democrats — not counting the obscure vanity runners — and two Republicans in contention.