Donald Glover's musical alter ego, Childish Gambino, performed his new song "This Is America" on "Saturday Night Live" last weekend. Now, the song's new music video, which has more than 62 million views on YouTube, is inspiring a national conversation about gun violence and racism. Rolling Stone contributor Tre Johnson joins "CBS This Morning" to discuss his initial reaction to the video, how it uses symbolism to tackle social issues, and why it represents a "shift" in Glover's brand.