This map compares Donald Trump's margins vs. Hillary Clinton in 2016 to his margins vs. Joe Biden in 2020. Numbers represent the difference in percentage points. Blue areas are where Trump had narrower margins in 2020, even if he still won the county. Conversely, red areas are where Trump increased his margin vs. the Dem candidate, even if he lost the county. The darkest shades of blue or red represent a change of four or more percentage points.