it simply is the islamic state and it's leader is a man who goes by al ba ghdadi. islamic state said once god and his messenger makes a decision, they don't have a choice but to fall in line. who is abu bakr al-baghdadi? that's our focus this time on inside story. >> delivering a sermon in mosul, iraq, in this video, a man who appears to be the elusive leader of the islamic state spoke for a half hour. he introduced himself as, your new caliph ibrahim. >> if you see me on the right path, help me. if you see me on a wrong path, lead me. >> baghdadi claims to trace his lineage back to mohammed giving him, some scholars say, legitimacy as religious leader. he was captured by u.s. forces. after his release he took over as head of al-qaeda in iraq branch. the leader at the time. abu omar was killed in a raid. al baghdadi's road to leadership, last year he openly deified the leadership, and joined forces fighting in syria . there was a letter ordering bagh hdadi to keep forces separate. if this is baghdadi in the mosque in mosul, it is proof in a nouri al-maliki has not b