https://morningconsult.com/2019/01/10/americas-most-and-least-popular-senators-q4-2018/
Jeff Flake (R-Ariz.), a vocal Trump critic, finished at the bottom in his last quarter in office.
Bernie Sanders (I-Vt.) was the most popular senator for the 11th time in a row.
Lisa Murkowski (R-Alaska) and Cindy Hyde-Smith (R-Miss.) saw 10-point drops in their net approval, the worst in the chamber
The latest rankings – based on surveys of 416,853 registered voters across the country conducted Oct. 1 through Dec. 31, 2018 (see methodology here) – found McConnell’s net approval increased 10 percentage points since the third quarter of 2018, with 38 percent of Kentucky voters approving of his job performance and 47 percent disapproving. The fourth quarter marks McConnell’s best showing since the second quarter of 2017 as he prepares for an expected re-election campaign in 2020. (Net approval is the share of voters who approve of a senator minus the share of voters who disapprove. Approval and disapproval figures are rounded.)