BARRY RITHOLTZ: Here's how the media should respond when a presidential candidate is caught lying

How should the media respond when a presidential candidate is caught lying?
I don’t mean the small political prevarications that all politicians engage in — I refer to the uniquely outsized BS that has been dominating this election cycle.
So far, the mainstream press has been doing a mostly terrible job. However, that may be changing. 
To wit: presidential candidate Donald Trump held a news conference Friday morning, where he:1) Promoted his commercial interests i