Good morning. It’s Monday, September 9th. The Democrats will be back on the debate stage this week, and this time, all of the leading 2020 candidates will go up against each other on the same night. For a while now, Joe Biden, Bernie Sanders and Elizabeth Warren have been at the top of every national and early-primary state poll. But analysts caution that the race is still more open than it may seem. But now, the Democratic primary will enter a new phase designed to thin the herd.