OK, here's the link: Golf lobby urges Rubio to drop the Obama golfing jokes.
And here's the joke from the comments:
Ye Can't Fool a Scottish Caddy
During his golfing vacation at Martha's Vineyard - President Obama had been slicing off the tee on every hole.
He asks his Scottish born caddy if he has noticed any obvious reasons for his poor tee shots, to which the caddy replies: "Aye, there's a piece of shyt on the end of yer driver."
The President picks up his driver and cleans the club face, at which point the caddy says:
"No, the other end."