Here's one before he was even in office
https://thinkprogress.org/fox-news-blames-obama-for-stock-market-fall-51289ab6fba1/
Here are others
https://thinkprogress.org/fox-business-channel-blames-obamas-victory-for-stock-market-dip-bee043ef8d4d/
It's harder to find the clips, but there were several and you know it.
A key personality trait you must have to be a Trump supporter: you have to be able to deny facts and create your own reality. it doesn't work if unless you can do that...