What better way to commemorate the 100th episode of the “Fast Fix” than to talk about the celebrity sideshow that is Donald Trump’s interest in running for president?

Trump has been everywhere of late, calling into question — bizarrely — the validity of President Obama’s birth certificate and generally creating havoc in the GOP field.

Ultimately it’s virtually impossible to imagine Trump making a serious run at the presidency.

Why? We explain in today’s episode of the “Fast Fix”. And, don’t forget to check out all of our “Fast Fix” videos here. And, if you have a topic you want to see us break down in “Fast Fix” just email chris.cillizza@wpost.com with it.