osman yaya , 12 , from bennett middle school in salisbury , maryland , moderated a town hall session with the president on thursday .
during an answer about writer 's block , obama started getting a little long-winded and osman stepped in .
` yeah . i think you 've sort of covered everything about that question , ' he said as the audience laughed .
obama grinned and replied , ` osman thinks i 've been talking too long '