Obama to frame election as 'commander-in-chief' test

US President Barack Obama will spearhead a Democratic effort to paint Donald Trump as unfit to be commander-in-chief Wednesday, contrasting the Republican nominee with his vastly more experienced rival Hillary Clinton. Obama, acting as a character reference for his former primary foe and secretary of state, will make the case to Democrats gathered in Philadelphia for their national convention that Clinton is uniquely qualified to be president. "Nothing truly prepares you for the demands of the O