Both can be true. Democrats tend to dominate the lowest income quintile, while Republicans tend to win the second and third quintiles. So if you're only looking at the bottom quintile, Democrats would win that cohort. If you combine the bottom three quintiles, Republicans would win it.
Both can be true. Democrats tend to dominate the lowest income quintile, while Republicans tend to win the second and third quintiles. So if you're only looking at the bottom quintile, Democrats would win that cohort. If you combine the bottom three quintiles, Republicans would win it.