How many Senators have tenures of over 50 years?
1
2
2
2
2
2
2
2
2
3
2
1
3
2
1
3
2
1
3
4
5
2
1
3
4
5
2
1
3
4
5
2
0
1
3
4
5
2
0
1
3
4
5
2
1
7
0
3
4
5
2
1
7
3
4
5
2
0
1
7
3
4
5
2
0
8
1
7
3
4
5
2
6
13
8
1
7
0
3
4
5
6
13
8
1
7
3
4
5
6
13
8
1
7
3
4
5
6
13
8
1
7
3
4
5
6
13
8
1
7
3
4
9
5
6
13
8
1
7
3
4
9
5
6
13
8
1
7
3
4
9
5
6
10
13
8
1
7
3
4
9
5
6
10
13
11
8
1
7
4
9
12
5
6
10
13
11
8
7
4
9
12
5
6
10
13
11
8
7
4
9
12
5
6
10
13
11
8
17
7
9
12
14
6
10
13
11
8
17
7
9
12
14
6
10
13
11
8
17
7
135