Table:
0
A
B
C
D
E
1
State (class)
Vacator
Reason for change
Successor
Date of successors formal installation
2
Missouri (3)
Vacant
Did not take seat until after Congress commenced
Waldo P. Johnson (D)
March 17, 1861
3
Kansas (2)
Vacant
Election not recognized by US Senate
James H. Lane (R)
April 4, 1861
4
Kansas (3)
Vacant
Election not recognized by US Senate
Samuel C. Pomeroy (R)
April 4, 1861
5
North Carolina (2)
Thomas Bragg (D)
Withdrew March 6, 1861; expelled later in 1861.
Vacant thereafter
Vacant thereafter
6
Texas (1)
Louis T. Wigfall (D)
Withdrew March 23, 1861
Vacant
Vacant for remainder of term
7
North Carolina (3)
Thomas L. Clingman (D)
Withdrew March 28, 1861; expelled later in 1861.
Vacant thereafter
Vacant thereafter
8
Illinois (2)
Stephen A. Douglas (D)
Died June 3, 1861. Successor was appointed.
Orville H. Browning (R)
June 26, 1861
9
Texas (2)
John Hemphill (D)
Expelled July ????, 1861
Vacant
Vacant for remainder of term
10
Arkansas (2)
William K. Sebastian (D)
Expelled July 11, 1861
Expelled July 11, 1861
Vacant thereafter
11
Arkansas (3)
Charles B. Mitchel (D)
Expelled July 11, 1861
Expelled July 11, 1861
Vacant thereafter
12
Michigan (2)
Kinsley S. Bingham (R)
Died October 5, 1861. Successor was elected.
Jacob M. Howard (R)
January 17, 1862
13
Tennessee (1)
Andrew Johnson (D)
Resigned March 4, 1862
Vacant thereafter
Vacant thereafter
14
Rhode Island (1)
James F. Simmons (R)
Resigned August 15, 1862. Successor was elected.
Samuel G. Arnold (R)
December 1, 1862
15
New Jersey (1)
John R. Thomson (D)
Died September 12, 1862. Successor was appointed.
Richard S. Field (R)
November 21, 1862

Questions and formulas:
Question: When did Orville H. Browning (r) succeed?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="Orville H. Browning (R)"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E15,D2:D15="Orville H. Browning (R)"),5))
Level: medium
Question: List all dates of succession in the state class Missouri (3).
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Missouri (3)"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E15,A2:A15="Missouri (3)"),5))
Level: medium