Cooper doesn't want it, and he'd be a worse candidate than Jackson, Stein, Ross, etc. if he did
WTF?
He means that Cooper wouldn't have the desire to run. I believe that he didn't run in 2020 because he figured that (1) he was still eligible to run for reelection as governor and (2) his immediate successor would be a Republican if he were to vacate his seat that year. He would be termed out of the governor's office in 2024, so he wouldn't have much to lose on that front after that (just like how Steve Bullock was easier to persuade to run for higher office compared to Chris Sununu, because the former was termed out of the governor's office while the latter was not).