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Sen. Michael “Mike” Mansfield

Former Senator from Montana, Democrat

Mansfield, a Democrat, was a senator from Montana from 1953 to 1976.

He was previously the representative for Montana's 1st congressional district (1943-1952).

Photo of Sen. Michael “Mike” Mansfield [D-MT, 1953-1976]


Our unique analysis of the bills Mansfield sponsored and cosponsored provides insight into his position in the Senate.

Each dot in the chart below was a member of the Senate in 1976. The dots are positioned horizontally according to our progressive—conservative ideology score and vertically according to our leadership score (leaders toward the top). Mansfield is shown as a purple triangle. (analysis methodology)

Enacted Legislation

Mansfield was the primary sponsor of 12 bills that were enacted. The most recent include:

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We consider a bill enacted if one of the following is true: a) it is enacted itself, b) it has a companion bill in the other chamber (as identified by Congress) which was enacted, or c) if about one third or more of its provisions were incorporated into bills that were enacted (as determined by an automated text analysis, applicable beginning with bills in the 110th Congress).

Bills Sponsored

Issue Areas

Mansfield sponsored bills primarily in these issue areas:

Private Legislation (43%) Government Operations and Politics (22%) International Affairs (12%) Crime and Law Enforcement (6%)

Recent Bills

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

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Voting Record

Missed Votes

From Jan 1953 to Oct 1976, Mansfield missed 1,155 of 7,342 roll call votes, which is 15.7%. This is worse than the median of 13.0% among the lifetime records of senators serving in Oct 1976. The chart below reports missed votes over time.

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Primary Sources

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