If the public sector won't have him, Mitt Romney is fine returning to the private one: He is taking a new post with son Tagg's venture capital firm, reports NBC News. Romney will serve as chair of Solamere Capital's executive committee, which translates into about a week of work per month advising on private-equity decisions. Letters have gone out to top investors, reports AP, which notes that Romney already was a limited partner at the Boston company. (More Mitt Romney stories.)