(CNN)Twenty-four hours after Massachusetts Sen. Elizabeth Warren shocked the political world with a five-minute video (and a mountain of documentation) aimed at putting to bed the controversy over her claims of Native American heritage, it's becoming increasingly clear the strategy amounts to a swing and a miss. Warren's goal was to take the issue of her heritage off the table for nervous Democrats and to show that she was ready, willing and able to stand up to President Donald Trump if and when the time came that she was the party's nominee against him in 2020. The problem is that,...