About This Blog

Welcome! My name is Nicolas Nevins, and I have created a mathematical formula intended to predict the results of US House Elections. I developed the formula over the past year, and it was quite accurate when retroactively applied to the 2012 and 2014 House elections (the only ones so far fully in the SuperPAC era). The formula includes many components that are believed to help predict the winner of US House races, such as fundraising, independent expenditures, partisanship of a district, and incumbency, among others. On this blog, I will publish and update my predictions for the 2016 elections.

Monday, October 3, 2016

10/3 Ratings Update

The rating changes made this week are primarily influenced by outside spending, or the lack of it, in several races. In addition, one change I am making to my formula beginning this week is that I will begin using the HuffPost Pollster average (http://elections.huffingtonpost.com/pollster/2016-national-house-race) for my generic congressional ballot average instead of arbitrarily assigning a value. This week, the average is Democrats +4.3, which is quite similar to what I had been using.
At this point, it seems unlikely that Democrats will be able to retake the house, as my current projected change is Democrats +16 seats, and the number of toss-ups has begun to dwindle, so that even if Democrats won every toss-up they would only pick up 22 seats, short of the 30 that they need. However, there are a few reasons why a Democratic takeover of the House is still possible:

  1. The October fundraising filing deadline has not yet passed, meaning that we are still using fundraising data from June in many races. This disproportionately helps incumbents in competitive races, most of whom are Republicans this year, because they have had much more time to fundraise than their challengers. As a result, this could artificially be giving some Republican incumbents a lead that will disappear once all candidates file updated fundraising totals on October 15.
  2. Outside spending organizations (SuperPACs), like the DCCC, NRCC, House Majority PAC, and the Congressional Leadership Fund, have only just begun to spend in races. According to my data from past years, outside spending disproportionately helps challengers, most of whom are Democrats this year. Although I do not know the exact reason for the trend, it is possibly because outside spending signals to voters that it is a competitive race and makes them more aware of the challenger and less likely to vote for the incumbent. Regardless of the reason for this trend, as outside spending increases, Democrats are likely to benefit.
  3. Donald Trump. Following the first Presidential debate, Donald Trump's poll numbers have already begun to decrease, and it is quite possible that Hillary Clinton could win a large victory of 5 points or even more nationally. This would likely help Democrats in House races, especially in districts where Donald Trump will do disproportionately poorly, like districts with a high population of Hispanics or people with a college degree. So far, Republican incumbents in these districts have done a good job of evading Donald Trump; there have been several polls released that show Hillary Clinton winning a district by a large margin yet the Republican incumbent still leads. However, if Hillary Clinton wins some districts with Republican incumbents by a large margin and outside spending can effectively tie Republican incumbents in these districts to Donald Trump, it is unlikely that these Republican incumbents will be able to survive.


Here are my rating changes for this week:
Race Rating Changes:





RacePrevious RatingUpdated Rating

CA10 - (Denham)
Toss-UpTilt Republican

FL25 - (Diaz-Balart)
Likely Republican
Safe Republican

FL26 - (Curbelo)Toss-UpTilt Democrat

IA03 - (Young)Toss-UpTilt Republican

MN02 - (OPEN)
Likely Democrat
Safe Democrat

MN08 - (Nolan)
Likely Democrat
Leans Democrat

MT00 - (Zinke)
Likely Republican
Safe Republican

NC06 - (Walker)
Likely Republican
Safe Republican

NH01 - (Guinta)Toss-UpTilt Democrat

NJ02 - (LoBiondo)
Leans Republican
Likely Republican

NV04 - (Hardy)Tilt DemocratToss-Up

NY19 - (OPEN)
Leans Democrat
Tilt Democrat

NY21 - (Stefanik)
Tilt Republican
Leans Republican

NY23 - (Reed)Tilt Republican
Leans Republican

OH01 - Chabot
Leans Republican
Likely Republican

UT04 - (Love)
Likely Republican
Safe Republican

WI06 - (Grothman)
Likely Republican
Safe Republican


Updated Race Ratings:










Safe Republican (Republican has >95% chance of winning)Likely Republican (Republican has 85%-95% chance of winning)Leans Republican (Republican has 75%-85% chance of winning)Tilt Repubican (Republican has 65%-75% chance of winning)Toss-Up (Either side has <65% chance of winning)Tilt Democrat (Democrat has 65%-75% chance of winning)Leans Democrat (Democrat has 75%-85% chance of winning)Likely Democrat (Democrat has 85%-95% chance of winning)Safe Democrat (Democrat has >95% chance of winning)

FL02 - (OPEN)AZ02 - (McSally)AK00 - (Young)CA10 - (Denham)CA25 - (Knight)AZ01 - (OPEN)MI01 - (OPEN)CA24 - (OPEN)FL10 - (OPEN)

MI08 - (Bishop)IL12 - (Bost)CA21 - (Valadao)FL13 - (Jolly)FL26 - (Curbelo)MN08 - (Nolan)MD06 - (Delaney)MN02 - (OPEN)

NC08 - (Hudson)MN03 - (Paulsen)CA49 - (Issa)FL18 - (OPEN)IA01 - (Blum)NE02 - (Ashford)VA04 - (OPEN)

NJ02 - (LoBiondo)MI06 - (Upton)CO03 - (Tipton)
FL27 - (Ros-Lehtinen)
IL10 - (Dold)NY03 - (OPEN)

NJ03 - (MacArthur)MI11 - (Trott)CO06 - (Coffman)ME02 - (Poliquin)NJ05 - (Garrett)PA08 - (OPEN)

NY11 - (Donovan)NC13 - (OPEN)FL07 - (Mica)NV04 - (Hardy)NV03 - (OPEN)

OH01 - (Chabot)NY21 - (Stefanik)IA03 - (Young)NY01 - (Zeldin)NH01 - (Guinta)

PA06 - (Costello)NY23 - (Reed)IN09 - (OPEN)NY24 - (Katko)NY19 - (OPEN)

SC05 - (Mulvaney)MI07 - (Walberg)PA16 - (OPEN)NY22 - (OPEN)

VA02 - (OPEN*)NY02 - (King)TX23 - (Hurd)

VA10 - (Comstock)VA05 - (OPEN)

WI08 - (OPEN)




All Other Seats Currently Held by RepublicansAll Other Seats Currently Held by Democrats



Projected Balance of Power: Currently 247 Republicans, 188 Democrats
D Pickups: 13     Toss-Ups: 11 (1D, 10R)     Projected Change: Democrats +16
R Pickups: 1                                                   Range: Democrats +11 - Democrats +22

New Balance of Power: 231 Republicans, 204 Democrats
Range: 225-236 Republicans, 199-210 Democrats 

Updated Map:
The map that I use is a hexagonal congressional district map, which is a map where every district is the same size geographically, making it possible to see districts in urban areas that cannot be distinguished under a normal congressional district map. I am using this map under a Creative Commons Attribution-ShareAlike 4.0 International license You can read more about it here: http://www.dailykos.com/story/2015/6/3/1389806/-Daily-Kos-Elections-presents-the-best-map-ever-of-United-States-congressional-districts

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