How far behind is too far?
Pick how far the second party trails and how long is left. We look up every one of 901 elections in ten countries and count how many came back.
4 of 12 · Every country
The odds of a comeback, 2½ years out runners-up by how far behind, every country
2–4 pts
4–6 pts
6–8 pts
8–10 pts
10–14 pts
14–20 pts
20+ pts
30% of runners-up 9.0 points or more behind finished first (6 of 20).
Today's races the second party in each of our averages, against every election we hold
Every runner-up that far behind 2½ years out 12 cases; comebacks first
The biggest comebacks from 2½ years out
How this works
For every election we hold polls for, we take each party's poll average at fixed points before polling day (two weeks, a month, two months, and so on to three years) and its gap to the party leading that average. Only the leader and the runner-up count: a comeback means the second party overtaking the first. A party "finished first" if it won the most votes, which is not always office: Gore in 2000 and Clinton in 2016 won the popular vote. "That far behind" means within two points either side of the figure you chose.
The data: Great Britain 1950–2024 (Mark Pack's PollBase; February 1974 only, as the two 1974 elections share a year); Australia, Canada, France (first round), Germany, Italy, the Netherlands, Poland and Spain from our own poll archive; US Senate, governor and presidential races state by state since 2000; the US national vote since 1952 (before 2000, Gallup's June poll only). Past comebacks are not a forecast: our forecast for each country already allows for how much polls move this far out.