Which candidate could best replace Biden?

A July 12 poll shows no candidate has a clear lead over Trump, though Gretchen Whitmer polls the weakest by a small margin.

July 9 - July 10 survey polling 1,309 U.S. adults with a margin of error of 3.1 percentage points, 1,174 registered voters with a margin of error of 3.3 percentage points and 954 registered voters who definitely plan to vote in November’s general election with a margin of error of 3.6 percentage points.
Chart: Alicja Hagopian Source: PBS News/Marist College (July 12th)
Independent