Democratic Massachusetts Sen. Elizabeth Warren kicked off her 2020 presidential campaign with a series of awkward gaffes and lingering questions about her alleged Native American ancestry. The day Warren announced she was launching an exploratory committee for a 2020 bid, she appeared on Instagram Live with her husband, Bruce Mann. In the video, Warren attempts to appear folksy as she tells viewers, "Hold on a sec, I'm gonna get me, um, a beer." Warren returns to the frame with a bottled beer and then wraps her entire mouth around the bottle neck as she takes a sip. Her husband declines...