New York (CNN Business) A version of this article first appeared in the "Reliable Sources" newsletter. You can sign up for free right here.

Nancy Pelosi announced the start of a formal impeachment inquiry into President Trump one month ago, on September 24. JUST one month ago. It's worth taking stock of how much has happened since — how many new pieces of the Ukraine puzzle, how many revelations about potential misconduct, how many desperate deflections by Trump and his allies.

Many prominent commentators read Bill Taylor's testimony on Tuesday and came away believing impeachment is now inevitable.

The Atlantic's David A. Graham made this point on Wednesday: "As the past month demonstrates, a lot can change in a few short weeks. One month ago, it wasn't clear there'd even be an impeachment inquiry. Today, impeachment itself is a near-certainty." Most of the chatter now is about what will happen when the Senate holds a trial...

One month from now...