He hasn’t been making headlines over the past few weeks, but Jon Santiago says he’s been laying the groundwork to win Boston’s 2021 mayoral contest — by landing key endorsements from elected officials, winning the support of unions, and talking with as many voters as possible. Santiago recaps his campaign’s progress in a conversation with Saraya Wintersmith and Adam Reilly. He also makes it clear that he has no intention of criticizing former Mayor Marty Walsh’s stewardship of the city — and suggests that Acting Mayor Kim Janey’s decision to delay Boston’s reopening may be a mistake. Plus, Santiago shares some biographical detail that may be unfamiliar even to close observers of Massachusetts politics.