A candidate for the 2018 U.S. Senate race in Massachusetts tweeted out a video on Sunday challenging Sen. Elizabeth Warren (D., Mass.) to prove her claims of having American Indian heritage. V.A. Shiva, who is seeking the Republican nomination in 2018 and has claimed he invented email, filmed himself holding a "23andMe" DNA testing kit, which he claims requires only his saliva and a "few short days" to prove if he was a real Indian. Shiva was born in Bombay, India, while Warren's claim is about having American Indian, or Native American, heritage. "I want to challenge Elizabeth Warren...