If something/person weighed more than 12 pounds, you would be correct. Since Obama weighed lest that one stone, only the mentions of pounds would be used.
Weights of adults would have been ___ stones and _____, second blank implying the number of pounds in addition to the number of stones.
I am assuming that the 7 in this case would be made as it is in Europe.
As Glenn Beck urges, keep battling, battle every day, rid America of this plage.