Obama was always late to pressers.
So was Clinton. Mike McCurry would plant a microphone in an area where the press members congregated while waiting for Clinton to arrive, and would listen in on their conversations with each other. That way, he knew what direction their questions would go.
It has amazed me how the press can remain loyal to Dem Presidents considering how they were treated. Clinton, biden, and especially Obama would make them wait for an hour or more. The last two would demand that questions be submitted in advance so that they could be vetted. Compare that with Bush and Trump. Bush was extremely punctual, never making them wait. And Trump gave them access more than any other President in history, often calling on reporters who hated him the most. Today's press are nothing more than a bunch of whores.
