B-b-but she didn’t lead in a single poll!
It's obvious that there still was some significant ticket-splitting in this election, but it appears to have mainly benefited Republicans. Collins, Cornyn, Perdue, and Tillis, for example, all ran ahead of Trump, and Phil Scott did better than Joe Biden in Vermont
Democrats are still less partisan than Republicans, so quite a few of them are willing to vote for so-called moderate hero Republicans. A noticeably larger percentage of Republicans than Democrats will never vote for the opposite party under any circumstance. That's why there are more Republicans elected statewide in deep blue states than vice versa, and these Republicans tend to win by bigger margins.
We’re is the moderate Democrat especially in the Senate that Republican could safely vote for
Manchin and Sinema are probably the only 2.
Furthermore, Main has been unique. That will pass when Collins passes.