Table:
0
A
B
C
D
E
F
1
District
Incumbent
Party
First elected
Result
Candidates
2
Minnesota 1
Tim Walz
Democratic
2006
Re-elected
Tim Walz (D) 57.6% Allen Quist (R) 42.4%
3
Minnesota 2
John Kline
Republican
2002
Re-elected
John Kline (R) 54.1% Mike Obermueller (D) 45.9%
4
Minnesota 3
Erik Paulsen
Republican
2008
Re-elected
Erik Paulsen (R) 58.2% Brian Barnes (D) 41.8%
5
Minnesota 5
Keith Ellison
Democratic
2006
Re-elected
Keith Ellison (D) 74.5% Chris Fields (R) 25.5%
6
Minnesota 6
Michele Bachmann
Republican
2006
Re-elected
Michele Bachmann (R) 50.6% Jim Graves (D) 49.4%

Questions and formulas:
Question: In what district was keith ellison the incumbent?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="Keith Ellison"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,B2:B6="Keith Ellison"),1))
Level: medium