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Ended his presentation. the emcee responded -- >> okay. that was a little bit different. >> reporter: there were other issues. joe bidens mic was turned off at one point. and the emcee had to blow and tap, tap and blow. organizers apologized and gave de blasio a second chance to speak. de blasio later joked, a canceled flight cant stop me from auditioning for alvin and the chipmunks. oh, were talking about it. >> my message comes down to three words, working people first. >> reporter: correction...

>> when he ended his presentation, the emcee responded, joe bidens mic was turned off at one point. >> spread it. go spread it, guys. >> and even the emcee had to blow and tap, tap and blow. organizers apologized and later gave de blasio a second chance to speak undistorted. de blasio later joked a cancelled flight cant stop me from auditioning for "alvin and the chipmunks." oh, were talking about it. >> my smessage is three words, working people first. >> correction, working audio first or your...