Table:
0
A
B
C
D
E
1
District
Vacator
Reason for change
Successor
Date successor seated
2
New Jersey 2nd
Vacant
Rep. T. Millet Hand died during previous congress
Milton W. Glenn (R)
November 5, 1957
3
Illinois 7th
James Bowler (D)
Died July 18, 1957
Roland V. Libonati (D)
December 31, 1957
4
Georgia 7th
Henderson L. Lanham (D)
Died November 10, 1957
Harlan E. Mitchell (D)
January 8, 1958
5
Pennsylvania 21st
Augustine B. Kelley (D)
Died November 20, 1957
John H. Dent (D)
January 21, 1958
6
Tennessee 8th
Jere Cooper (D)
Died December 18, 1957
Robert "Fats" Everett (D)
February 1, 1958
7
New Jersey 14th
Vincent J. Dellay (R)
Changed political affiliation some time in 1958
Vincent J. Dellay (D)
????, 1958
8
Illinois 14th
Russell W. Keeney (R)
Died January 11, 1958
Vacant
Not filled this term
9
Minnesota 1st
August H. Andresen (R)
Died January 14, 1958
Al Quie (R)
February 18, 1958
10
Wisconsin 1st
Lawrence H. Smith (R)
Died January 22, 1958
Vacant
Not filled this term
11
New Mexico At-large
John J. Dempsey (D)
Died March 11, 1958
Vacant
Not filled this term
12
Louisiana 8th
George S. Long (D)
Died March 22, 1958
Vacant
Not filled this term
13
Illinois 4th
William E. McVey (R)
Died August 10, 1958
Vacant
Not filled this term
14
Pennsylvania 28th
Herman P. Eberharter (D)
Died September 9, 1958
Vacant
Not filled this term
15
Illinois 20th
Sid Simpson (R)
Died October 26, 1958
Vacant
Not filled this term

Questions and formulas:
Question: who is the vacator whre the district is new jersey 2nd?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="New Jersey 2nd"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E15,A2:A15="New Jersey 2nd"),2))
Level: medium