Article continues below advertisementIn his forthcoming memoir, Young Man in a Hurry, California Gov. Gavin Newsom (D) admitted he wasn't fully invested in his marriage to Kimberly Guilfoyle and has one major regret about it.The 58-year-old presidential hopeful recounted his four-year marriage to the 56-year-old former Fox News fixture and admitted he wasn't all in. Instead of regretting his emotional unavailability, he wished he had given more to his dying mother.