Table:
0
A
B
C
D
E
F
1
Incumbent
Reason for Vacancy
Appointed Successor
Date of Appointment
Elected Successor
Date of Election
2
L. B. Lindsay
Disqualified, never took office
Henry E. Prickett
November 19, 1867
Thomas B. Hart
January 1868
3
John Hailey
Never took office
Charles Himrod
July 10, 1871
George H. Twitchell
July 8, 1872
4
Sol Hasbrouck
Resigned November 5, 1885
James W. Huston
December 28, 1885
Peter J. Pefley
July 1887
5
Harry Fritchman
Resigned May 25, 1912
Arthur Hodges
May 25, 1912
Arthur Hodges
April 1, 1913
6
J. W. Robinson
Recalled June 1, 1916
S. H. Hays
June 6, 1916
S. H. Hays
April 1917
7
Herbert F. Lemp
Died May 6, 1927
Walter F. Hansen
May 6, 1927
James P. Pope
April 1929
8
James P. Pope
Resigned February 13, 1933
Ross Cady
February 13, 1933
J. J. McCue
April 1933
9
Byron E. Hyatt
Died November 11, 1936
J. L. Edlefsen
November 11, 1936
J. L. Edlefsen
April 1937
10
H. W. Whillock
Resigned May 11, 1942
Austin Walker
May 11, 1942
Austin Walker
April 1943
11
Austin Walker Sam S. Griffin
Died October 31, 1945 Resigned February 25, 1946
Sam S. Griffin H. W. Whillock
October 31, 1945 February 25, 1946
Potter P. Howard
April 1947
12
Dirk Kempthorne
Resigned January 5, 1993
H. Brent Coles
January 5, 1993
H. Brent Coles
November 1993

Questions and formulas:
Question: What was the election date for H. Brent Coles?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1="H. Brent Coles"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F12,C2:C12="H. Brent Coles"),6))
Level: medium
Question: What was the election date for Arthur Hodges?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1="Arthur Hodges"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F12,E2:E12="Arthur Hodges"),6))
Level: medium