Sen. Michael “Mike” Mansfield

Former Senator from Montana

Elected Positions

Dates	Title	Representing
1959-1976	Senator	Montana
1953-1958	Senator	Montana
1947-1952	Representative	Montana's 1^st District
1943-1946	Representative	Montana's 1^st District

Sponsorship Analysis

Mansfield was a rank-and-file Democrat according to GovTrack's own analysis of bill sponsorship from Mansfield’s time serving in the Senate.

Use this chart to compare Mansfield to other members of the Senate in the 94^th Congress on leadership and ideology.

This chart is based on principal components analysis for ideology and PageRank for leadership. See analysis methodology.

Bill Sponsorship & Cosponsorship

Some of Mansfield’s most recently sponsored bills include...

View All » (including bills from previous years)

Voting Record

From Jan 1953 to Oct 1976, Mansfield missed 648 of 6,795 roll call votes, which is 9.5%. This is better than the median of 11.7% among the lifetime records of senators serving in Oct 1976. The chart below reports missed votes over time.

Show the numbers...

Time Period	Votes Elligible	Missed Votes	Percent	Percentile
1953 Jan-Mar	9	0	0.0%	0^th
1953 Apr-Jun	41	0	0.0%	0^th
1953 Jul-Jul	36	0	0.0%	0^th
1954 Jan-Mar	30	0	0.0%	0^th
1954 Apr-Jun	46	0	0.0%	0^th
1954 Jul-Sep	89	0	0.0%	0^th
1954 Dec-Dec	8	0	0.0%	0^th
1955 Jan-Mar	26	0	0.0%	0^th
1955 Apr-Jun	37	3	8.1%	72^nd
1955 Jul-Aug	22	0	0.0%	0^th
1956 Jan-Mar	47	1	2.1%	56^th
1956 Apr-Jun	50	1	2.0%	53^rd
1956 Jul-Jul	30	0	0.0%	0^th
1957 Jan-Mar	16	2	12.5%	81^st
1957 Apr-Jun	44	6	13.6%	81^st
1957 Jul-Aug	43	0	0.0%	0^th
1958 Feb-Mar	38	0	0.0%	0^th
1958 Apr-Jun	84	0	0.0%	0^th
1958 Jul-Aug	74	0	0.0%	0^th
1959 Jan-Apr	56	9	16.1%	91^st
1959 May-Aug	119	58	48.7%	97^th
1959 Sep-Sep	29	18	62.1%	97^th
1960 Jan-Apr	71	24	33.8%	91^st
1960 May-Aug	118	40	33.9%	97^th
1960 Sep-Sep	5	5	100.0%	88^th
1961 Jan-Apr	29	0	0.0%	0^th
1961 May-Aug	126	0	0.0%	0^th
1961 Sep-Sep	30	0	0.0%	0^th
1962 Jan-Mar	22	2	9.1%	82^nd
1962 Apr-Jun	62	2	3.2%	29^th
1962 Jul-Sep	116	1	0.9%	13^th
1962 Oct-Oct	16	0	0.0%	0^th
1963 Jan-Mar	7	0	0.0%	0^th
1963 Apr-Jun	53	0	0.0%	0^th
1963 Jul-Sep	44	4	9.1%	53^rd
1963 Oct-Dec	83	0	0.0%	0^th
1964 Jan-Mar	46	1	2.2%	51^st
1964 Apr-Jun	73	1	1.4%	56^th
1964 Jul-Sep	99	1	1.0%	20^th
1964 Oct-Oct	1	0	0.0%	0^th
1965 Jan-Mar	27	1	3.7%	33^rd
1965 Apr-Jun	93	1	1.1%	4^th
1965 Jul-Sep	92	2	2.2%	22^nd
1965 Oct-Oct	15	1	6.7%	28^th
1966 Jan-Mar	26	1	3.8%	36^th
1966 Apr-Jun	48	7	14.6%	46^th
1966 Jul-Sep	107	6	5.6%	44^th
1966 Oct-Oct	33	0	0.0%	0^th
1967 Jan-Mar	44	6	13.6%	54^th
1967 Apr-Jun	64	8	12.5%	63^rd
1967 Jul-Sep	72	12	16.7%	69^th
1967 Oct-Dec	80	2	2.5%	9^th
1968 Jan-Mar	56	13	23.2%	87^th
1968 Apr-Jun	79	2	2.5%	9^th
1968 Jul-Sep	81	10	12.3%	43^rd
1968 Oct-Oct	24	0	0.0%	0^th
1969 Jan-Mar	12	1	8.3%	78^th
1969 Apr-Jun	24	2	8.3%	40^th
1969 Jul-Sep	39	0	0.0%	0^th
1969 Oct-Dec	146	9	6.2%	25^th
1970 Jan-Mar	86	2	2.3%	14^th
1970 Apr-Jun	81	7	8.6%	48^th
1970 Jul-Sep	112	2	1.8%	6^th
1970 Oct-Dec	102	3	2.9%	12^th
1971 Feb-Mar	23	5	21.7%	75^th
1971 Apr-Jun	82	5	6.1%	12^th
1971 Jul-Sep	106	11	10.4%	39^th
1971 Oct-Dec	194	13	6.7%	25^th
1972 Jan-Mar	116	1	0.9%	8^th
1972 Apr-Jun	126	57	45.2%	90^th
1972 Jul-Sep	190	1	0.5%	8^th
1972 Oct-Oct	72	0	0.0%	0^th
1973 Jan-Mar	63	14	22.2%	80^th
1973 Apr-Jun	192	5	2.6%	11^th
1973 Jul-Sep	163	6	3.7%	31^st
1973 Oct-Dec	165	5	3.0%	21^st
1974 Jan-Mar	90	15	16.7%	76^th
1974 Apr-Jun	169	7	4.1%	25^th
1974 Jul-Sep	135	1	0.7%	7^th
1974 Oct-Dec	132	48	36.4%	91^st
1975 Jan-Mar	115	9	7.8%	65^th
1975 Apr-Jun	134	0	0.0%	0^th
1975 Jul-Sep	166	3	1.8%	9^th
1975 Oct-Dec	176	17	9.7%	52^nd
1976 Jan-Mar	98	12	12.2%	60^th
1976 Apr-Jun	250	34	13.6%	57^th
1976 Jul-Sep	307	89	29.0%	85^th
1976 Oct-Oct	13	13	100.0%	76^th

Primary Sources

The information on this page is originally sourced from a variety of materials, including:

Congressional Biographical Directory for elected positions
United States Congressional Roll Call Voting Records, 1789-1990 by Howard L. Rosenthal and Keith T. Poole.
Martis’s “The Historical Atlas of Political Parties in the United States Congress”, via Keith Poole’s roll call votes data set, for political party affiliation for Members of Congress from 1789 through about year 2000
Biographical Directory of the United States Congress for the photo
THOMAS, for sponsored bills

Recent Legislative Activity

Elections and Offices

Sen. Michael “Mike” Mansfield [D-MT, 1959-1976] leaves office as Senator from Montana

Oct 01, 1976

Elections and Offices

Sen. Michael “Mike” Mansfield [D-MT, 1959-1976] takes office as Senator from Montana

Jan 07, 1959

Elections and Offices

Sen. Michael “Mike” Mansfield [D-MT, 1959-1976] leaves office as Senator from Montana

Aug 24, 1958

Elections and Offices

Sen. Michael “Mike” Mansfield [D-MT, 1959-1976] takes office as Senator from Montana

Jan 03, 1953

Elections and Offices

Sen. Michael “Mike” Mansfield [D-MT, 1959-1976] leaves office as Representative for Montana's 1st congressional district

Jul 07, 1952