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Ballotpedia reports race ratings from four outlets: The Cook Political Report, Inside Elections, Sabato's Crystal Ball, and DDHQ/The Hill. This page explains how ratings are defined and assigned by these outlets. If you're wondering what the difference is between a safe and a likely Democratic race, or what it means for a race to tilt instead of lean Republican, you're in the right place.
Each race rating indicates if one party is perceived to have an advantage in the race and, if so, the degree of advantage. The following are general definitions for each rating, arranged from highest to lowest degree of party advantage.
Rating definitions vary slightly from one outlet to another. You can compare each outlet's published definitions in the table below.[3][4][5][6]
There is no exhaustive list of the factors these outlets may consider when rating any given race. The Cook Political Report, Inside Elections, and Sabato's Crystal Ball each said that their ratings are informed by a number of factors, including polling, candidate quality, and election result history in the race's district or state.[7][8][9]
Inside Elections editor Nathan Gonzalez told us they also consider fundraising, breaking news, and incumbent strength when rating races. Kyle Kondik, the managing editor of Crystal Ball, noted fundraising and the national political environment as considerations. Charlie Cook, then-editor of Cook Political Report, said their ratings are also informed by meetings with candidates and by conversations with political operatives, party strategists, and state sources.
Factors vary; research and judgment are the threads that run throughout the ratings.