Hillary Clinton is viewed unfavorably by 57 percent of Americans, an all-time worst in her political career and a precipitous drop from just two years ago, according to the latest Gallup poll.

Just 38 percent view Clinton favorably, compared to 55 percent in 2014, Gallup reported. Further, Clinton's image took a 3-point dive in just one month, down from 41 percent favorable in June.

Clinton's highest favorable rating was at 67 percent in late 1998.

Other results:

  • Donald Trump's image is at 36 percent favorable, 59 percent unfavorable the past seven days;
  • 71 percent of Democrats and left-leaning independents view Clinton favorably;
  • Trump's favorability among Republicans improved to 72 percent during convention week.

Gallup reported that the only comparable election between two highly unpopular candidates was 1992 (Ross Perot, George H.W. Bush).