Nice! The Donkeys were also on my mind but I wasn’t sure if there was any evidence for that. 

I doubt the Cards have even been heavily favored often enough to count. 

1. Chargers
2. Jags
3. Raiders 
4. Broncos
5. Any NFC South team

Undisciplined

NFL teams with the worst straight-up record when favored over the last decade (2016–2026):

Carolina Panthers: 22–32 as favorites — 40.7% win rate

Stacker_Sports

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gsc360

NFL teams with the worst straight-up record when favored over the last decade (2016–2026):

Carolina Panthers: 22–32 as favorites — 40.7% win rate
New York Jets: 17–21 — 44.7%
Arizona Cardinals: 26–27–1 — 49.1%
Jacksonville Jaguars: 32–25 — 56.1%
Atlanta Falcons: 50–38 — 56.8%
Denver Broncos: 47–32 — 59.5%