Maybe because you linked to a document that ranks total state taxes instead of per capita taxes? (which is incredibly misleading regardless of whether or not it was deliberate)

Tough crowd.

Here goes, taxes are lower in South Dakota.

http://www.taxfoundation.org/research/topic/37.html

"Minnesota ranks 43rd in the Tax Foundation's State Business Tax Climate Index."

"Neighboring states ranked as follows: North Dakota (25th), South Dakota (1st), Iowa (46th) and Wisconsin (42nd)."

"Minnesota's 2008 state-level individual income tax collections were $1,493 per person, which ranked 5th highest nationally."

Because the supporting document shows total state taxes, not tax rates. In other words, the supporting document doesn't.