2020 Pennsylvania Democratic presidential primary

! colspan="4"| Pledged national
convention delegates

| 8

| CD10

| 7

| 8

| CD11

| 5

| 14

| CD12

| 4

| 10

| CD13

| 4

| 9

| CD14

| 5

| 8

| CD15

| 4

| 7

| CD16

| 5

| 6

| CD17

| 8

| 4

| CD18

| 9

| 20

| At-large

| 41

! colspan="12" |Polling Aggregation

! Source of poll aggregation

! Date
updated

! Dates
polled

! Joe
Biden

! Bernie
Sanders

! Other/
Undecided{{efn|name=undecided|Calculated by taking the difference of 100% and all other candidates combined}}

| Mar 18, 2020

| Feb 11–Mar 8, 2020

| {{party shading/Democratic}}| 39.5%

| 28.0%

| 32.5%

| Feb 23, 2020

| Jan 20–Feb 20, 2020

| {{party shading/Democratic}}| 39.5%

| 28.0%

| 32.5%

|Mar 8, 2020

|until Feb 20, 2020{{Efn|FiveThirtyEight aggregates polls with a trendline regression of polls rather than a strict average of recent polls.|name=trendline|group=}}

| {{party shading/Democratic}}| 54.4%

| 29.3%

| 16.3%

| {{party shading/Democratic}} |44.5%

| 28.4%

| 27.1%

! Poll source

! Date(s)
administered

! Sample
size{{efn|name=key|{{Polling Table Key}}}}

! Margin
{{nowrap|of error}}

! Joe
Biden

! Michael
Bloomberg

! Cory
Booker

! Pete
Buttigieg

! Kamala
Harris

! Beto
O'Rourke

! Bernie
Sanders

! Elizabeth
Warren

! Other

! Undecided

| style="border-right-style:hidden;"|

| style="border-right-style:hidden;"| Apr 8, 2020

| colspan="12" | Sanders suspends his campaign

| Mar 6–8, 2020

| –(RV){{efn|name=YouGovMIPAWI|Part of a 1,750 registered voter poll of Michigan, Pennsylvania, and Wisconsin}}

| ± 5.1%

|{{party shading/Democratic}}|59%

| –

| –

| –

| –

| –

|31%

| –

| –

| –

| style="border-right-style:hidden;"|

| style="border-right-style:hidden;"| Mar 1–5, 2020

| colspan="12" | Buttigieg, Klobuchar, Bloomberg and Warren withdraw from the race

| Feb 11–20, 2020

| 537 (LV)

| –

| 20%

| 19%

| –

| 12%

| –

| –

| {{party shading/Democratic}}|25%

| 9%

| 5%{{efn|Klobuchar with 5%; "Others" not reported separately}}

| 10%{{efn|contains also "others"}}

| style="border-right-style:hidden;"|

| style="border-right-style:hidden;"| Feb 11, 2020

| colspan="12" | New Hampshire primary; Yang withdraws from the race after close of polls

| Jan 20–26, 2020

| 292 (RV)

| ± 9.0%

|{{party shading/Democratic}}|22%

| 7%

| –

| 6%

| –

| –

| 15%

| 14%

| 18%{{efn|Yang and Klobuchar with 5%; "Other" with 2%; "None" with 6%}}

| 19%

| Jan 8–20, 2020

| 502 (RV)

| –

| {{party shading/Democratic}}|31.3%

| 9.1%

| –

| 6.5%

| –

| –

| 20.5%

| 11.5%

| 8.8%{{efn|Klobuchar and Yang with 2.5%; Bennet with 1.2%; Steyer with 1%; Gabbard with 0.9%; Delaney with 0.4%; Patrick with 0.3%}}

| 11%

| style="border-right-style:hidden;"|

| style="border-right-style:hidden;"| Dec 3, 2019–Jan 13, 2020

| colspan=12 | Harris and Booker withdraw from the race

| style="border-right-style:hidden;"|

| style="border-right-style:hidden;"| Nov 24, 2019

| colspan="12" | Bloomberg announces his candidacy

| style="border-right-style:hidden;"|

| style="border-right-style:hidden;"| Nov 1, 2019

| colspan=12 | O'Rourke withdraws from the race

| Oct 21–27, 2019

| 226 (RV)

| ± 8.9%

|{{party shading/Democratic}}|30%

| –

|1%

|8%

|1%

|<1%

|12%

|18%

|15%{{efn|Bennet, Gabbard and Klobuchar with 2%; Yang with 1%; Bullock with <1%; none with 8%; other with 0%}}

|16%

| Oct 13–26, 2019

| 304

| –

| {{party shading/Democratic}}| 28%

| –

| 0%

| 4%

| 1%

| 0%

| 14%

| 16%

| 3%{{efn|Yang with 2%; Klobuchar with 1%; others with 0%}}

| 30%

| Sep 23–Oct 15, 2019

| 246 (LV)

| –

|{{party shading/Democratic}}|27%

| –

|1%

|3%

|4%

|No voters

|14%

|18%

|5%{{efn|Yang with 2%; Klobuchar and Steyer with 1%; Bennet, Bullock, Delaney, Gabbard, Messam, O'Rourke, Ryan, Sestak and Williamson with no voters; refused with 1%}}

|{{party shading/Undecided}}|29%

| Sep 30–Oct 6, 2019

| 307 (RV)

| ± 5.6%

| {{party shading/Democratic}}|17%

| –

| 0%

| 8%

| 1%

| 0%

| 6%

| 9%

| 7%{{efn|Bennet with 2%; Klobuchar with 1%; Bullock, Castro, Delaney, Gabbard, Messam, Ryan, Sestak, Steyer, Williamson and Yang with 0%; someone else/none with 3%; refused to answer with 1%}}

| {{party shading/Undecided}}|52%

| Jul 29–Aug 4, 2019

| 295

| ± 8.7%

| {{party shading/Democratic}}| 28%

| –

| 2%

| 6%

| 8%

| 1%

| 12%

| 21%

| 3%{{efn|Bullock, Gabbard, and "Other" with 1%}}

| 19%

| May 23–29, 2019

| 246

| ± 6.3%

| {{party shading/Democratic}}| 46%

| –

| 2%

| 9%

| 3%

| 2%

| 15%

| 8%

| 2%{{efn|Castro, Gillibrand, and Yang with 1%; Delaney, Gabbard, Hickenlooper, Inslee, and Klobuchar with 0%}}

| –

| May 9–14, 2019

| 431

| ± 6.2%

| {{party shading/Democratic}}| 39%

| –

| 5%

| 6%

| 8%

| 2%

| 13%

| 8%

| 3%{{efn|Klobuchar with 1%; Bennet, Castro, Delaney, Gabbard, Gillibrand, Hickenlooper, Inslee, Messam, Moulton, Ryan, Swalwell, Williamson, and Yang with <1%; others with 2%}}

| 12%

| style="border-right-style:hidden;"|

| style="border-right-style:hidden;"| Apr 25, 2019

| colspan="13" | Biden announces his candidacy

| style="border-right-style:hidden;"|

| style="border-right-style:hidden;"| Apr 14, 2019

| colspan="13" | Buttigieg announces his candidacy

| Apr 3–10, 2019

| 405

| ± 5.5%

| {{party shading/Democratic}}| 28%

| –

| 3%

| 4%

| 8%

| 3%

| 16%

| 8%

| 9%{{efn|Klobuchar with 3%; others with 6%}}

| 20%

| Mar 26–28, 2019

| 359

| ± 5.1%

| {{party shading/Democratic}}| 39%

| –

| 4%

| 6%

| 5%

| 5%

| 20%

| 11%

| 10%{{efn|Gabbard with 3%; Gillibrand with 2%; Castro and Yang with 1%; Hickenlooper, Inslee, and Klobuchar with 0%; others with 4%}}

| –