How many CDs has Biden won?

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CA-04: Trump +9.9%
CA-21: Biden +10.9%
CA-25: Biden +10.1%
CA-45: Biden +11.3%
CA-49: Biden +12.7%
CA-50: Trump +7.7%

https://twitter.com/rpyers/status/1336357162080034818

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Results in MD:
https://twitter.com/greggiroux/status/1336778339508510721
Unsurprisingly, Trump only won MD-01, based on the Eastern Shore, although he did significantly worse there compared to 2016.

Somehow, there were people who split their ticket between Biden and Andy Harris. I get the people who voted Biden and split for Fitzpatrick or Katko, but Andy Harris is a far-right nutjob who loves Orban and refused to denounce QAnon. Someone explain this.

Incumbency bonus + low information voters who vote for the dude they know (same reason why you have Trump/Cartwright voters).

No. Cartwright is a fake moderate who relies on his district's ancestrally D lean and underfunded/underwhelming R opponents to win, but he isn't really offensive and partisan unlike Andy Harris.

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Cartwright is a member of the CPC so he is pretty partisan.

Anyway my point was that people who voted Biden/Harris or Trump/Cartwright are generally low info voters who vote for the incumbent simply because they have never heard of their opponent, you can say the same about people who voted Brown/Jordan in 2018 or people who voted Trump/Durbin, these persons are not very logical nor ideological.

I think that's more like a #populist  thing. DeFazio and Kildee are members of the CPC as well.

I completely agree with the second part of your post, but Biden/A. Harris is much weirder than Trump/Cartwright IMO.

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Cartwright is a member of the CPC so he is pretty partisan.

Anyway my point was that people who voted Biden/Harris or Trump/Cartwright are generally low info voters who vote for the incumbent simply because they have never heard of their opponent, you can say the same about people who voted Brown/Jordan in 2018 or people who voted Trump/Durbin, these persons are not very logical nor ideological.

I think that's more like a #populist  thing. DeFazio and Kildee are members of the CPC as well.

I completely agree with the second part of your post, but Biden/A. Harris is much weirder than Trump/Cartwright IMO.

Did Defazio even outperform Biden?

He did, but by only 1%.

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Biden carried CO-06 by 19%.

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Trump carried MN-01 by only 10%. He won it by 15% in 2016.