Clinton campaign weighs implications of potential Joe Biden challenge. (New York Times)
Hillary Clinton is set to air first campaign tv ads. (Wall Street Journal)
Charles Koch invokes fight for civil rights as model for political activism. (Washington Post)
Ted Cruz, Jeb Bush shine at Koch brothers event. (Bloomberg Politics)
Ted Cruz says climate-change fears falsified by scientists and politicians. (Time)
14 Republican candidates to take questions from voters tonight. (New Hampshire Union Leader)
Nearly 60 donors give one-third of all 2016 campaign cash. (AP)
What are you reading this morning? Let us know in the comments, please.