In the most recent Gallup poll (2-2-21), 52 percent of the American people favored conviction and 45 percent opposed, close to the Senate vote of 57 to 43 for acquittal. Of course, the conviction required two-thirds (66 votes). Post impeachment trial saw a spike in support for conviction. An ABC News/Ipsos poll showed 58 percent post trial favored conviction.
Even the Republican Senate vote roughly corresponded to the Gallup poll. Forty-three Republicans out of 50 voted for conviction, or 86 percent. The poll recorded 88 percent of Republicans identified favoring acquittal (14%, or 7 for conviction, the poll had 10%).