Click the map above or this link to go to an interactive version: Dave’s Redistricting App
By Jim Ellis
Feb. 24, 2022 — As more states complete their redistricting process and additional data becomes available, we are beginning to catch a glimpse of each party’s path to either keeping or re-claiming the House majority in the coming midterm election.
The FiveThirtyEight statistical organization along with the Dave’s Redistricting App operation are the two data groups that are charting each district as the states complete their decennial task of drawing new congressional district boundaries.
At this point, we have usable projection data from the two organizations in 350 of the nation’s 435 congressional districts, meaning newly completed maps in all but eight states. (FiveThirtyEight has not yet analyzed the new North Carolina map because the court has not yet given final approval, but Dave’s App has calculated based upon the version now before the judicial panel.) As an aside, several of the outstanding states are large, including Florida (28 congressional districts), Ohio (15 CDs: map was complete but rejected before the state Supreme Court), and Pennsylvania (17 CDs).
At this point we can see, after analyzing each of the 350 completed districts, that redistricting in and of itself will return only a narrow advantage to one party or the other. Considering the still incomplete outstanding states, it is unclear which political entity may earn a slight advantage once the entire process is finalized. Currently, newly created maps are complete (or pending court approval) in 42 states, including five of the six at-large domains whose single-state districts are included in the aforementioned aggregate number.
The FiveThirtyEight projections and Dave’s Redistricting App agree on party advantage in 344 of the completed districts even though they used different mathematical formulas and election complexion to arrive at their conclusions. Therefore, the assigned D or R-plus ratings from FiveThirtyEight consistently align with Dave’s numerical projections for Democratic and Republican strength in each of the 344 CDs.
Of the six districts where the two organizations disagree over party advantage, in each of the half-dozen CDs, the FiveThirtyEight data has projected a stronger Republican number. Three of the six lie in the state of Michigan.
The conflicting districts are:
| STATE-DIST | MEMBER | FiveThirtyEight | DAVE R | DAVE D |
|---|---|---|---|---|
| CO-8 | NEW SEAT | R+3 | 46.91% | 48.24% |
| MI-7 | SLOTKIN, ELISSA | R+4 | 47.75% | 49.18% |
| MI-8 | KILDEE, DAN | R+1 | 46.05% | 50.84% |
| MI-10 | CREATED SEAT | R+6 | 47.82% | 49.44% |
| TX-15 | CREATED SEAT | EVEN | 46.73% | 51.02% |
| VA-2 | LURIA, ELAINE | R+6 | 48.35% | 49.58% |
(Note: a “New Seat” is one drawn in a state that was awarded an extra seat, or two in the case of Texas, through national reapportionment. A “created seat” is a new open district that came as a result of the redistricting process.)
Totaling the 344 districts where FiveThirtyEight and the Dave’s App are in agreement as to party advantage, the Democrats would gain 12 Republican, new, or created districts; while the GOP would gain 10 Democratic, new, or created seats.
Feb. 23, 2021 — The Daily Kos Elections website staff have just completed the calculations they perform after every presidential election: that is, determining how all 435 congressional district electorates voted for president, and then cross-referencing that result with their US House vote.
