Welcome to Trail Guide, your daily host through the wilds of the 2016 presidential campaign. It's Wednesday, Sept. 23, and this is what we're watching:
- Carly Fiorina's positions have shifted since her failed 2010 Senate run note The Times' Mark Z. Barabak and Seema Mehta
- Pope Francis' arrival creates a political opening for some White House hopefuls reports The Times' Kurtis Lee
- Dr. Ben Carson returns to his home state of Michigan for a rally amid fallout over his assertion that Muslims should not be president
- Sen.