Table:
0
A
B
C
D
E
1
District
Incumbent
Party
First elected
Results
2
Minnesota 1
Gil Gutknecht
Republican
1994
Lost re-election Democratic gain
3
Minnesota 2
John Kline
Republican
2002
Re-elected
4
Minnesota 3
Jim Ramstad
Republican
1990
Re-elected
5
Minnesota 4
Betty McCollum
Democratic
2000
Re-elected
6
Minnesota 5
Martin Sabo
Democratic
1978
Retired Democratic hold
7
Minnesota 6
Mark Kennedy
Republican
2000
Retired to run for U.S. Senate Republican hold
8
Minnesota 7
Collin Peterson
Democratic
1990
Re-elected
9
Minnesota 8
Jim Oberstar
Democratic
1974
Re-elected

Questions and formulas:
Question: What is First Elected, when District is "Minnesota 2"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="minnesota 2"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,A2:A9="minnesota 2"),4))
Level: medium
Question: What is the lowest First Elected, when Party is "Republican", and when District is "Minnesota 1"?
Formula: MIN(FILTER(D1, (C1="republican")*(A1="minnesota 1")))
Formula2: MIN(FILTER(D2:D9, (C2:C9="republican")*(A2:A9="minnesota 1")))
Level: easy
Question: What is Party, when Results is "Re-Elected", when First Elected is greater than 1990, and when District is "Minnesota 4"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(E1="re-elected")*(D1>1990)*(A1="minnesota 4")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,(E2:E9="re-elected")*(D2:D9>1990)*(A2:A9="minnesota 4")),3))
Level: medium
Question: What is Incumbent, when Results is "Re-Elected", when Party is "Democratic", and when District is "Minnesota 7"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(E1="re-elected")*(C1="democratic")*(A1="minnesota 7")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,(E2:E9="re-elected")*(C2:C9="democratic")*(A2:A9="minnesota 7")),2))
Level: medium