Josh Kraft, the longtime nonprofit leader and younger son of billionaire New England Patriots owner Robert Kraft, has filed paperwork with state campaign finance regulators to run for mayor of Boston as a Democrat.

The philanthropist and son of billionaire Patriots owner Robert Kraft is preparing to challenge Boston Mayor Michelle Wu.

"At some point, when you’re the candidate, you’re going to have to speak for yourself and not just have the consultants do it for you," Wu said.