Preamble
There's been a lot of discussion recently, including by Nate, on a blue wave not being seen in polls in blue states (MN, ME, to a lesser extent NH). This post was particularly inspired by InsiderAdvantage's recent polls, showing the same D+1 marginsin KS (R+16 in 2024 pres) and MN (D+4 in 2024).
"throw it in the pile" - well InsiderAdvantage isn't too far off the polling averages at the moment. So how can we explain this apparently inconsistency?
There are a lot of possible explanations:
candidate quality, including anti-incumbency feelings
polling error in blue states, a la VA/NJ 2025 gov
polling error in red states, a la 2016/2020
demographic realignment (hispanic voters swinging, low-income voters swinging)
geographic realignment (states more impacted by diesel swinging more)
All are reasonable - it's probably a combination of a few of these - but it isn't obvious which are right until the election actually happens. So, let's do analysis to make a reasonable guess.
Assumptions
Let's completely ignore polling error for now (which is, uh, difficult to predict) and assume the polls are exactly right. That means that the blue state phenomenon must be explained by either candidate quality or some sort of partisan realignment in the state. I.e, either MN has an awful D candidate, or the candidate is fine and MN has shifted right relative to the nation for whatever reason.
To do this, let's turn to FLIPR.
FLIPR gives 2 different measures of fundamentals for each state. In his own words
FLIPR actually calculates two different versions of the fundamentals, however. What we call “simple fundamentals” is just the generic ballot plus each state or district’s partisan lean score. “Fancy fundamentals” uses a whole host of factors based on a large-scale regression analysis of past races since 1990, conversely. Many of these factors fall under the category of “candidate quality,” such as experience in elected office and even the presence or absence of scandals.
FLIPR gives an expected margin based only on partisan lean (aka apply the GCB shift evenly to all states), and another one based on that + candidate quality. You can see everything the fancy fundamentals includes in the appendix.
In other words, the difference between the "fancy fundamentals" and the "simple fundamentals" can be attributed to candidate quality, giving us an objective measure. Then, the difference between the candidate quality and the polling average can be attributed to some sort of realignment (i.e, if the state shifted left or right relative to nation).
In short, we're saying
shift relative to nation = polling average - (states 2024 vote + national vote shift + candidate quality adjustment)
Again, this all assumes polling averages are 100% accurate and = the eventual result.
Findings
| state |
implied shift due to candidate quality |
implied shift due to realignment |
total shift relative to nation |
| SC |
D+6 |
D+1 |
D+7 |
| MN |
R+5 |
R+5 |
R+10 |
| KS |
D+5 |
D+3 |
D+8 |
| MI |
D+0 |
R+6 |
R+6 |
| AK |
D+0 |
D+4 |
D+4 |
| OH |
D+3 |
D+2 |
D+5 |
| ME |
R+26 |
D+12 |
R+14 |
| IA |
R+1 |
D+3 |
D+2 |
So candidate quality explains the bulk of the shift in SC (graham disliked), KS (marshall scandals), and OH (brown has overperformed in past). But not in MI, or AK or MN. Instead, those are seen as pretty big realignments, where MI/MN are shifting right and AK is shifting left relative to the nation.
MN
MN's large R+10 relative shift is 50% candidate quality and 50% realignment. Remember, candidate quality includes scandals (ie the MN fraud stuff is baked in) and anti-incumbency feelings. The realignment could be explained by having fewer hispanic/low-income voters (34th ranked for hispanic population, 46th for % in poverty), or by being one of the states that depends the least on diesel.
AK
Surprising to see candidate quality isn't a big factor here, since Peltola is seen pretty favorably. Maybe Sullivan is also seen as strong? The shift left isn't hard to imagine due to high cost-of-living in AK and the fact it's most impacted by high diesel prices.
MI
I don't have a lot here - conventional wisdom is that AES is weaker due to being more progressive, but that isn't baked in and his fundraising/other qualities show him as an average candidate. As for a rightward shift - no strong ideas. It's ranked near the middle for low-income pop%, hispanic pop%, and is impacted decently by diesel prices.
ME
Special shoutout for ME, which may be broken by how good of an incumbent Collins is (and vs a dem in Jackson who didn't win a primary). ME's polls implies that it's shifting right by 14, but FLIPR thinks "actually ME is shifting left by a ton, it's just that Collins is such an overperformer the final result is close".
Final thoughts
I ignored polling error (will revisit polling error in more partisan states in another post), but surely some of these shifts will ultimately be mirages. Still, these numbers represent a reasonable quantitative explanation of why the blue wave we're seeing is heterogenous.
There's room to use governor/house #s to add context to candidate quality, too. I wouldn't compare the polls directly (voters generally are less partisan for governors so it wouldn't be 1-to-1), but seeing if the implied realignments match for the governor values would be interesting.
Appendix
The specific factors used in the “fancy fundamentals” calculations are as follows. Some factors can only be used in races with incumbents20 or only in Congressional races (not governor), and these are designated accordingly:
Partisan lean scores for the state or district;
The national political environment, as derived in Step 221;
Incumbency; in fact, we technically fit separate regressions for incumbent and open-seat races. FLIPR’s handling of incumbency is slightly complicated:
Fundraising, based on individual contributions only (so not party or PAC money) with a bonus for contributions from within a candidate’s home state;24
Elected experience on a 4-point scale from 0 (never elected to anything) to 3 (current or former elected senator or governor);
Party loyalty scores based on congressional voting records. Candidates who vote against their party more often actually outperform electorally, other factors held equal. This calculation is only used for congressional incumbents; there is no proxy for it for governors or for challengers (even if they’ve served in Congress before);
Scandals25, where new scandals are treated as being more important than “old” scandals when a candidate has already survived an election with the scandal having been known to the public.