Morning Joe: Bernie Sanders Doubles His Lead Over Biden in the Latest Poll

EXCERPT:

BRZEZINSKI: "Oh my gosh. Tonight should be very exciting. A look at the Democratic field for president ahead of tonight’s debate. The latest NBC News/'Wall Street Journal' poll shows Bernie Sanders now with a double-digit national lead in that primary race at 27 percent, the senator's 12 point margin over Joe Biden isn’t because he gained support over the past month, it’s because Biden lost 11 points and is now at 15%. That is a statistical tie with Mike Bloomberg and Elizabeth Warren who are both at 14%. Bloomberg up 5 while Warren lost a point. Pete Buttigieg also within the margin of error for second place at 13%, up 6 points since last month. Amy Klobuchar gained 2 points, now at 7%."