The caption reads:
"A secret service agent removes a sticker that a vandal managed to affix to the side of President Obama's limousine. The sticker said "Molon Labe", which is a saying that is growing in popularity in the wake of the latest discussions about pending gun control legislation. It is latin for "Come and take them", referring to citizen's guns"
Firstly, it is not Latin, it is Greek. Secondly, this photo is probably faked / photo-shopped It is highly unlikely that the secret service, who guards the limo 24 hrs, would be lax enough in security to allow this to happen.
But fake or not, this picture seems to be having the effect of a rallying cry. Americans were already buying up guns in record numbers before the presumed upcoming ban on sales. And now that confiscation and registration legislation is being discussed, more Americans seem to be saying "Molon Labe".