The most bipartisan lawmakers in the Senate last year were mostly Republicans, while Democrats were ranked least likely to see eye-to-eye with those across the aisle, according to a study released Monday.

Sen. Susan Collins of Maine was ranked the most bipartisan senator, and she was followed by two other Republicans, Rob Portman of Ohio and Shelley Moore Capito of West Virginia, according to the Lugar Center and Georgetown University’s McCourt School of Public Policy biannual study.

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