Who Will be President?

  

Clinton Lost, Trump Won; But Were Forecasters Wrong?

National Overview

Presidential elections are all about who can get to 270 electoral votes. After simulating the election ten-thousand times, the model predicts a 316-222 electoral win for Hillary Clinton. We expect her final margin in the popular vote to be around +2.8 points, down from +3.9 points a week ago.

plot of chunk simulations

Odds of a candidate's victory are always changing. Here's how the odds have changed over time.

plot of chunk oddsovertime

 

Where Will the Candidates Win?

Here are some electoral maps based on margins of victory. In darker blue states, Clinton is favored to win by a wider margin, while in darker red states, Trump is favored.

Below is the map we usually see during during presidential elections. It's deceiving, however, because many states that are spatially large don't have a large population, and therefore are assigned few electoral votes (e.g. Wyoming).

plot of chunk map1
Clinton                                    Trump
Tossup

 

 

This next map is a little better for viewing the number of state-by-state contests won, but it still doesn't give a sense of how many electoral votes each candidate is winning.

plot of chunk map2
Clinton                                    Trump
Tossup

 

 

This final map is the best because it weights the size of each state by the number of electoral votes. So lots of blue or red for a candidate means a sizable lead in the electoral college.

plot of chunk map3
Clinton                                    Trump
Tossup

 

 

State-by-State Trends

Odds of a candidate's victory are updated whenever new polling information is available. For states with enough polling data, here's how the chances have evolved over time.

plot of chunk states

 

Margins of Victory

Which states will be close and which ones will be blowouts? Here's how the margins of victory will probably play out. For Trump, the biggest blowout should be Wyoming, where the model expects him to win by around 23 points. Clinton's biggest blowout should be Washington DC, where she is expected to win by 81 points. The error bars are 80% confidence intervals.

plot of chunk margins

 

Possible Scenarios

Here are the odds we'll see these election scenarios.

Electoral Tie (269-269) 0.4%
Clinton victory while losing at least 1 swing state (FL, VA, NC, PA, OH) 72.7%
Trump victory while losing at least 1 swing state (FL, VA, NC, PA, OH) 8.8%
Clinton wins all 5 swing states 17.7%
Trump wins all 5 swing states 0.5%
Clinton outperforms Obama 2012 (>332 EV) 31%
Trump outperforms Romney 2012 (>206 EV) 67.8%
Clinton blowout (>380 EV) 1.7%
Trump blowout (>380 EV) <.1%

 

Current Forecasts

Here are all of the current forecasts for the general election. The model predicts that Hillary Clinton will win 26 of 51 electoral contests (remember, DC gets 3 electoral votes).

State Electoral Votes Winner Odds of Victory Margin of Victory
State Electoral Votes Winner Odds of Victory Margin of Victory
Alabama 9 Trump 99.7% +18.6
Alaska 3 Trump 99.2% +14.7
Arizona 11 Trump 53.4% +0.6
Arkansas 6 Trump 99.8% +19.7
California 55 Clinton 96.4% +16.9
Colorado 9 Clinton 83.9% +5.2
Connecticut 7 Clinton 96.9% +13.9
Delaware 3 Clinton 96.8% +12.3
Washington DC 3 Clinton 99.9% +81.4
Florida 29 Clinton 70.9% +3.2
Georgia 16 Trump 61.9% +2.4
Hawaii 4 Clinton 96.4% +16.9
Idaho 4 Trump 99.8% +20
Illinois 20 Clinton 97.3% +14.8
Indiana 11 Trump 99.5% +15.3
Iowa 6 Trump 75.3% +5.1
Kansas 6 Trump 99.5% +16.3
Kentucky 8 Trump 99.8% +20
Louisiana 8 Trump 99.5% +16.3
Maine 4 Clinton 96.3% +10.1
Maryland 10 Clinton 96% +17.5
Massachusetts 11 Clinton 96.4% +16.9
Michigan 16 Clinton 83.9% +5.2
Minnesota 10 Clinton 93.8% +8.3
Mississippi 6 Trump 97.2% +12.3
Missouri 10 Trump 92.7% +10.1
Montana 3 Trump 99.7% +18.3
Nebraska 5 Trump 99.7% +18.6
Nevada 6 Clinton 69.5% +3
New Hampshire 4 Clinton 92.5% +7.8
New Jersey 14 Clinton 96.9% +13.9
New Mexico 5 Clinton 83.9% +5.2
New York 29 Clinton 96.4% +16.9
North Carolina 15 Clinton 74.5% +3.8
North Dakota 3 Trump 99.8% +21.2
Ohio 18 Trump 55.3% +1
Oklahoma 7 Trump 99.6% +22.6
Oregon 7 Clinton 96.6% +12.5
Pennsylvania 20 Clinton 82.7% +5
Rhode Island 4 Clinton 97% +14.4
South Carolina 9 Trump 77.8% +5.8
South Dakota 3 Trump 99.7% +19
Tennessee 11 Trump 97.8% +12.7
Texas 38 Trump 89.2% +8.8
Utah 6 Trump 95% +10.9
Vermont 3 Clinton 96% +17.5
Virginia 13 Clinton 93.8% +8.3
Washington 12 Clinton 97% +14.4
West Virginia 5 Trump 99.8% +21.6
Wisconsin 10 Clinton 83.9% +5.2
Wyoming 3 Trump 99.5% +23.1

 

 

Acknowledgments: The design of the final electoral cartogram was created by Adam McCann and can be found here.

Elliott Evans, University of Michigan