Update:
Democratic nomination
Biden 30.5
Harris 19.3
Buttigieg 7.5
Warren 6.2
Adams 5.1
Clinton 3.6
M. Obama 3.6
Duckworth 3.4
Newsom 2.3
S. Rice 2.2
Republican nomination
Trump 47.6
DeSantis 20.8
Pence 10.9
Haley 7.8
Pompeo 3.8
Noem 2.6
Cruz 2.4
Cotton 2.3
Four years ago at about this time:
Democratic nomination:
Sanders 20.1
Biden 18.0
Harris 16.8
Warren 12.8
Gillibrand 9.5
Booker 7.0
Winfrey 6.4
Brown 5.3
Republican nomination:
Trump 69.2
Pence 14.7
Eight years ago at about this time:
Dems
Clinton 65.8
Biden 7.2
Warren 6.5
Cuomo 4.0
GOP
Bush 20.0
Rubio 16.8
Paul 11.4
Christie 10.0
Walker 6.8
Cruz 5.7
Ryan 4.8
Huckabee 4.5
Twelve years ago at about this time on Intrade:
https://talkelections.org/FORUM/index.php?topic=93015.msg2510749#msg2510749
Romney 22.5
Palin 20.0
Thune 15.0
Gingrich 10.0
Pawlenty 6.5
Jeb Bush 4.1
Huckabee 3.8
Daniels 3.5
Paul 3.5
Pence 2.5
Trump surging?! It feels like his standing has declined meaningfully in the past 6 weeks.