Welcome to Trail Guide, your daily tour along the road to the White House. Here's what we're watching Sunday, Aug. 2:
- Will Vice President Joe Biden leap into the 2016 presidential race? A decision isn't expected until September, but questions about his possible candidacy made news this weekend. The Times' Michael Memoli explores.
- Jeb Bush, Marco Rubio and Ted Cruz are in Dana Point, Calif., for a retreat attended by wealthy conservative donors who are closely tied to the billionaire brothers Charles and David Koch
- Wisconsin Gov. Scott Walker visited the retreat on Saturday and talked immigration and President Obama's faith
- Dr.