Welcome to Trail Guide, your daily run along the road to the White House. It's Wednesday, Sept. 2, and this is what we're watching:
- Carly Fiorina is likely to make the main debate Sept. 16. She'll have to do more than attack Hillary Rodham Clinton to stand out this time
- Polls out of Iowa show Ben Carson surging. What do Iowans love about Carson?
- Scott Walker is meeting and greeting and eating barbecue in Dallas
- Marco Rubio will talk energy policy in Oklahoma City
No matter how he fares next year, Donald Trump's presidential campaign will be remembered for its remarkable use of free media to get out his message.