Welcome to Trail Guide, your daily tour along the road to the White House. It's Thursday, Aug. 13, and this is what we're watching:
- Hillary Rodham Clinton picked up a coveted endorsement from liberal ex-senator Tom Harkin as she tries to fend off Bernie Sanders' challenge from the left
- Clinton, Jeb Bush and others are at the Iowa State Fair this weekend. What will they say? What will they eat? The Times' Seema Mehta is on the ground
- Both Donald Trump and Bernie Sanders are tapping into anti-establishment, pro-outsider views of voters nationwide.