A couple of days ago I saw a clip of W. at a campaign rally and noticed that his suit jacket looked as though it was bulkier than usual. It definitely appeared as though he was wearing a vest underneath.
He often wears a vest. I recall right after 9/11 when he threw the opening pitch in Yankee Stadium, It appeared that he might have had the full ceramic plate-type vest. And he still threw a curveball strike.
Fact is, there's probably multiple threats made on the President every day. Most are meaningless talk. A few are more serious. Occasionally, I would hazard a guess that the USSS thwarts an attempt either directly or through creating the scenario where most plans cannot be carried out.
It is odd though that this would suddenly become newsworthy on Drudge. The only thing I can think of is that an outside threat is being dealt with. Still, most USSS activity is done in a relatively stealth mode.