In the southwest they have these small cans of Snappy Tom(Not Clamato!) to add some flavor, body and nutrition to a Coors draft and other SW ilk. I think this is just a commercial rip off a long standing SW drinkiing style. Pop a top again and add a Snappy Tom instead!
It's called a michelada. it's a fairly common drink in Mexico. In the southern US people have been drinking "bloody beers"(same minus the clam juice) for ages. I think the Bud Micheladas aren't bad.not the same as fresh made but not bad at all.