*On the "Sunday Spin": Tribune political reporter Rick Pearson's guests are LaVonte Stewart, executive director of the violence prevention group Lost Boyz Inc.; Illinois Comptroller Susana Mendoza on contracting in the Rauner administration; and state Sen. Jason Barickman, R-Bloomington, on his support for legalized marijuana for recreational use. The "Sunday Spin" airs from 7 to 9 a.m. on WGN-AM 720.