Our highly accurate race ratings in 2020 were based on a similar model. In fact, our high-turnout scenario nailed the final result, when it came to pass that historic turnout powered Democratic gains. Our 2018 model performed particularly well, steadily tracking Democrats' improvement in key congressional races and the eventual blue wave in the House. Moreover, we have a strong track record employing similar models at CBS News over the past few years. While we take a different approach than traditional polling, the Battleground Tracker is based on rigorous methods from the fields of political science, survey research, and statistics. A race that's leaning toward a party today could be reclassified as a toss-up if it becomes more competitive. Similarly, our qualitative ratings of individual races reflect their current status. We fully anticipate movement before the first vote is cast, so we'll update everything regularly in the months ahead.įor example, if we estimate a party at 230 seats with a margin of error of ☑2 seats, we are confident that their support translates to between 218 and 242 seats today - that's different from forecasting their final tally. There's nothing here to account for forward-looking uncertainty - we don't model changes in economic conditions or future campaign dynamics, for example. Unlike forecasting, we're estimating each candidate's current support, incorporating all the data we've collected up to this point. We tell you where races stand today, explaining why and what might change. Biden and the state of the country, lots of Democratic members of Congress retiring, and indications of a Republican turnout advantage - all of which add up to a favorable environment for GOP pickups. On top of that, we've seen dissatisfaction with Mr. And even if Democrats saw voters slightly shift toward them, they simply have fewer pickup opportunities than Republicans do this year. However, enough of those districts are close enough so that a small vote shift toward Republicans would flip many seats. If the national popular vote ended up tied 50-50, Republicans would be expected to win the majority of seats.īased on 2020 presidential votes, President Biden's performance was sufficient to have carried a majority of the new districts nationwide. And despite the population growth among racial minorities over the past decade, many states did not add minority districts. Democrats often find their voters packed into fewer districts, due both to their propensity to live in more concentrated areas and to gerrymandering, which packs voters by design. House districts is a challenge for Democrats and gives Republicans a built-in advantage. We collaborate on data collection and modeling with YouGov, building on our successful 2018 Battleground Tracker, as well as the 2020 edition that encompassed both the presidential primaries and general election. The survey lets them tell us what they are thinking, and we map that to how many of them live in each district. The same applies for many other types of voters. If we find Hispanic voters across the South shifting support, for instance, we use the information to more precisely estimate specific districts in which Hispanic voters live. A feature of this technique is that we use trends across the country to inform our picture of a specific district. Our model combines all this data using multilevel regression with post-stratification. We estimate how many voters like them are in each state and district, as well as their turnout history, from voter files and Census data.Īnd we know each state and district's previous election results, which enables us to anchor our 2022 estimates to recent history. We learn which party different kinds of voters are supporting from our ongoing polling, which includes much bigger samples - in the tens of thousands - than most surveys. Census data, and historical election results to render a clearer picture of what's going on in every state and district. At its core is a statistical model fueled by big data. While surveying voters across the country is an integral part of the Battleground Tracker, this is a lot more than your typical poll. Our approach also gives you a sense of what voters in different parts of the country think about this year's candidates and big issues. The Battleground Tracker estimates individual districts and translates each major party's current support to the metric that matters: seats in Congress. Indeed, relying too much on national polling can be misleading, because the party that wins the most votes nationally doesn't necessarily win the most seats. We take a district-by-district approach to analyzing races and measuring public opinion, since control of Congress is won across hundreds of individual elections, not by national popular vote.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |