How many Senators have tenures of over 50 years?
1
1
1
1
2
1
2
1
2
1
2
1
2
1
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
0
4
3
2
5
0
4
3
2
5
4
3
6
2
5
4
3
6
5
4
3
6
5
7
4
3
6
5
7
4
3
6
5
7
4
3
6
5
7
4
6
5
7
8
6
5
7
8
6
5
7
8
9
6
7
8
9
6
7
8
9
6
7
8
9
11
6
7
8
9
11
6
7
8
9
11
6
7
8
9
11
6
7
10
8
9
11
6
7
10
8
9
11
6
13
7
10
8
9
11
6
13
7
10
8
9
11
6
13
7
10
12
8
One
9
11
13
7
10
12
8
One
9
128
62
66
ONE
128
59
62
66