List of United States Senators From Pennsylvania - Class 1

Class 1

Class 1 U.S. Senators belong to the electoral cycle that were elected for one session of the U.S. Congress in the first election of 1788 and whose seats in recent years are contested in 1994, 2000, 2006, and 2012.

# Senator Party Years Congress Term Electoral history
1 William Maclay Anti-Administration March 4, 1789 –
March 3, 1791
1 1 Elected in 1789

Lost re-election
Vacant March 4, 1791 –
December 1, 1793
2 2
3
2 Albert Gallatin Anti-Administration December 2, 1793 –
February 28, 1794
Elected late in 1793

Election voided on the grounds that he had not met the residency requirements for eligibility to the office.
Vacant March 1, 1794 –
April 23, 1794
3 James Ross Federalist April 24, 1794 –
March 3, 1803
3
Elected to finish Gallatin's term
4
5 3 Re-elected in 1797

6
7
4 Samuel Maclay Democratic-
Republican
March 4, 1803 –
January 4, 1809
8 4 Elected in 1803

Resigned, believing he would lose re-election
9
10
Vacant January 4, 1809 –
January 9, 1809
5 Michael Leib Democratic-
Republican
January 9, 1809 –
February 14, 1814
10
Elected to finish Maclay's term
11 5 Elected in 1809

Resigned to become Postmaster of Philadelphia
12
13
6 Jonathan Roberts Democratic-
Republican
February 24, 1814 –
March 3, 1821
Elected to finish Leib's term
14 6 Re-elected in 1815

15
16
Vacant March 4, 1821 –
December 10, 1821
17 7 Legislature failed to elect
7 William Findlay Democratic-
Republican
December 10, 1821 –
March 3, 1827
Elected late in 1821

Retired
Jacksonian
Republican
18
Jacksonian 19
8 Isaac D. Barnard Jacksonian March 4, 1827 –
December 6, 1831
20 8 Elected in 1827

Resigned to due ill health
21
Vacant December 6, 1831 –
December 13, 1831
9 George Mifflin Dallas Jacksonian December 13, 1831 –
March 3, 1833
21
Elected to finish Barnard's term

Retired
22
10 Samuel McKean Jacksonian March 4, 1833 –
March 3, 1839
23 9 Elected in 1832

24
25
Vacant March 4, 1839 –
January 14, 1840
26 10 Legislature failed to elect
11 Daniel Sturgeon Democratic January 14, 1840 –
March 3, 1851
26
Elected late in 1839
27
28
29 11 Re-elected in 1844
30
31
12 Richard Brodhead Democratic March 4, 1851 –
March 3, 1857
32 12 Elected in 1850

33
34
13 Simon Cameron Republican March 4, 1857 –
March 4, 1861
35 13 Elected in 1856

Resigned to become U.S. Secretary of War
36
37
Vacant March 4, 1861 –
March 14, 1861
14 David Wilmot Republican March 14, 1861 –
March 3, 1863
37
Elected in 1861 to finish Cameron's term

Retired
15 Charles R. Buckalew Democratic March 4, 1863 –
March 3, 1869
38 14 Elected in 1862

39
40
16 John Scott Republican March 4, 1869 –
March 3, 1875
41 15 Elected in 1868

Retired
42
43
17 William A. Wallace Democratic March 4, 1875 –
March 3, 1881
44 16 Elected in 1874

Lost re-election
45
46
18 John I. Mitchell Republican March 4, 1881 –
March 3, 1887
47 17 Elected in 1880

48
49
19 Matthew S. Quay Republican March 4, 1887 –
March 3, 1899
50 18 Elected in 1886
51
52
53 19 Re-elected in 1892

Legislature failed to re-elect
54
55
Vacant March 4, 1899 –
January 16, 1901
56 20 Quay was appointed to continue the term, but the Senate declared him not entitled to the seat
20 Matthew S. Quay Republican January 16, 1901 –
May 28, 1904
Elected late in 1901

Died
57
58
21 Philander C. Knox Republican June 10, 1904 –
March 4, 1909
Appointed to continue Quay's term
Elected to finish Quay's term
59 21 Re-elected in 1902

Resigned to become U.S. Secretary of State
60
61
Vacant March 4, 1909 –
March 17, 1909
22 George T. Oliver Republican March 17, 1909 –
March 3, 1917
61
Elected to finish Knox's term
62 22 Re-elected in 1911

Retired
63
64
23 Philander C. Knox Republican March 4, 1917 –
October 12, 1921
65 23 Elected in 1916

Died
66
67
Vacant October 12, 1921 –
October 24, 1921
24 William E. Crow Republican October 24, 1921 –
August 2, 1922
Appointed to continue Knox's term

Died
Vacant August 2, 1922 –
August 8, 1922
25 David A. Reed Republican August 8, 1922 –
January 3, 1935
Appointed to continue Knox's term
Elected both to finish Knox's term and to the next term
68 24 Elected in 1922
69
70
71 25 Re-elected in 1928

Lost re-election
72
73
26 Joseph F. Guffey Democratic January 3, 1935 –
January 3, 1947
74 26 Elected in 1934
75
76
77 27 Re-elected in 1940

Lost re-election
78
79
27 Edward Martin Republican January 3, 1947 –
January 3, 1959
80 28 Elected in 1946
81
82
83 29 Re-elected in 1952

Retired
84
85
28 Hugh Scott Republican January 3, 1959 –
January 3, 1977
86 30 Elected in 1958
87
88
89 31 Re-elected in 1964
90
91
92 32 Re-elected in 1970

Retired
93
94
29 John Heinz Republican January 3, 1977 –
April 4, 1991
95 33 Elected in 1976
96
97
98 34 Re-elected in 1982
99
100
101 35 Re-elected in 1988

Died
102
Vacant April 4, 1991 –
May 9, 1991
30 Harris Wofford Democratic May 9, 1991 –
January 3, 1995
102
Appointed to continue Heinz's term
Elected to finish Heinz's term

Lost re-election
103
31 Rick Santorum Republican January 3, 1995 –
January 3, 2007
104 36 Elected in 1994
105
106
107 37 Re-elected in 2000

Lost re-election
108
109
32 Bob Casey, Jr. Democratic January 3, 2007 –
Present
110 38 Elected in 2006
111
112
# Senator Party Years Congress Term Electoral history

Read more about this topic:  List Of United States Senators From Pennsylvania

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