SAG-AFTRA, the union representing thousands of actors, remains on strike despite receiving what it says is a "last, best and final" three-year contract offer from producers. But one observer tells CBS News that the use of artificial intelligence remains a sticking point. Carter Evans reports. #sagaftrastrike #sagaftra #union Each weekday morning, "CBS Mornings” co-hosts Gayle King, Tony Dokoupil and Nate Burleson bring you the latest breaking news, smart conversation and in-depth feature reporting. "CBS Mornings" airs weekdays at 7 a.m. on CBS and stream it at 8 a.m. ET on the CBS News app. Subscribe to “CBS Mornings” on YouTube: youtube.com/CBSMornings Watch CBS News: cbsn.ws/1PlLpZ7c Download the CBS News app: cbsn.ws/1Xb1WC8 Follow "CBS Mornings" on Instagram: bit.ly/3A13OqA Like "CBS Mornings" on Facebook: bit.ly/3tpOx00 Follow "CBS Mornings" on Twitter: bit.ly/38QQp8B Subscribe to our newsletter: cbsn.ws/1RqHw7T​ Try Pa...