https://fivethirtyeight.com/features/how-every-senator-ranks-according-to-popularity-above-replacement-senator/

«Finally, the senator who ranks last in PARS is also up for reelection in 2020, and it’s a big name: Majority Leader Mitch McConnell. McConnell manages just a -13 net approval rating despite inhabiting an R+23 state. It’s not crazy to think he could be vulnerable in 2020. Democrats are reportedly trying to recruit former Marine fighter pilot Amy McGrath, who raised $8.6 million for an unsuccessful 2018 congressional bid, to run against him. But it’s worth remembering that Lucy has held this football in front of Democrats before. In 2014, McConnell also had popularity problems, and Democrats thought they had a top candidate to challenge him in Secretary of State Alison Lundergan Grimes. McConnell beat Grimes 56 percent to 41 percent.»