Josh Kraft, a political newcomer who is running as a Democrat, said his top priority was addressing the city’s housing crisis.

Josh Kraft, son of New England Patriots owner Robert Kraft, officially launched a campaign to become mayor of Boston Tuesday in Grove Hall, using his debut to knock Mayor Michelle Wu on her first term.

The third son of Patriots owner Robert Kraft, Josh Kraft has had a long career of nonprofit leadership in Boston — work that went beyond just showing up with a check, friends and colleagues said.