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1 in 10
Chance the Democrat wins (9.4%)
9 in 10
Chance the Republican wins (90.6%)
Chance of winning
Popular vote share
We've collected one poll for the South Carolina 1st. We’re adjusting poll results in three ways: Polls of registered voters or all adults are adjusted to a likely-voter basis; older polls are adjusted based on shifts in the generic congressional ballot since the poll was conducted; and polls are adjusted for house effects (the tendency for a firm’s polls to lean toward Democrats or Republicans). Polls with larger sample sizes and those conducted by higher-quality polling agencies are given more weight, as are more recent polls.
|margin||likely voter||Time-line||House effects||Adjusted margin|
|Public Policy Polling|
A = adults
RV = Registered voters
V = voters
LV = likely voters
= partisan poll
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#Similar districts and CANTOR
Our district similarity scores are based on demographic, geographic and political characteristics; if two districts have a score of 100, it means they are perfectly identical. These scores inform a system we use — CANTOR, or Congressional Algorithm using Neighboring Typologies to Optimize Regression — to infer what polling would say in unpolled or lightly polled districts, given what it says in similar districts.
Districts most similar to the South Carolina 1st
|Sim. score||Polling avg.|
The Classic and Deluxe versions of our model use several non-polling factors to forecast the vote share margin in each district.
|SC-1 is 18.9 percentage points more Republican-leaning than the country overall, based on how it has voted in recent presidential and state legislative elections. It voted for Trump in 2016 and Romney in 2012.|
|Previous incumbent's margin in last election|
|A Republican won by 21.7 percentage points in this district in 2016. Previous district results are not strongly predictive in races without incumbents.|
|Democrats lead by an average of 8.6 percentage points in polls of the generic congressional ballot.|
|As of Oct. 17, Joe Cunningham had raised $1,900,000 in individual contributions (72% of all such contributions to the major-party candidates); Katie Arrington had raised $731,000 (28%).|
|Arrington has held elected office before but Cunningham hasn't.|
|Neither candidate is involved in a scandal.|
The Deluxe version of our model calculates an implied margin for each race based on expert race ratings from The Cook Political Report, Inside Elections and Sabato's Crystal Ball; it then adjusts that margin toward its estimate of the national political environment.
|Cook Political Report||R+6.7||R+6.1|
|Sabato's Crystal Ball||R+6.7||R+7.1|
How this forecast works
Nate Silver explains the methodology behind our 2018 midterms forecast. Read more …