Clinton's favorability rating is now 21 points higher than Sanders'

Hillary Clinton keeps moving further from Bernie Sanders' reach. A new Gallup poll out Friday reveals the former secretary of state has further increased her favorability lead over the Vermont senator, rising 8 points from late September and early October to secure a 21-point lead in favorability.

Now, 76 percent of Democrats say they have a favorable opinion of Clinton, while only 18 percent say they don't, giving her a net positive of +58 points. Sanders' net favorability is +37 points, with 51 percent favorable and 14 percent unfavorable.

In even further bad news for Sanders' already long-shot bid against Clinton is the sweeping nature of her increased favorability — and Sanders' across-the-board declines. While Clinton's favorability rose among women by one point and with young people by seven points, Sanders' ratings went down. Still, he leads Clinton among 18-29 year olds, with 50 percent to Clinton's 39 percent, marking the last demographic group he has a hold on.

The poll's margin of error for both candidates' ratings is plus or minus 4 percentage points.