Hey, great! I got one:

The President climbed out of his helicopter in front of the White House
carrying a baby pig under each arm.

The Marine guard snapped to attention, saluted, and said:
"Nice pigs, sir."

The President replied: "Marine, these are not pigs, these are authentic
Texas Razorback Hogs. I got one for Vice President Cheney and I got
another for Karl Rove."

The Marine again snapped to attention, saluted, and replied, "Nice
trade, sir!"