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After the death of incumbent Democrat senator Dennis Chavez, Gov. Mechem appointed himself to fill the vacant seat.

After the death of incumbent Democrat senator Dennis Chavez, Gov. Mechem appointed himself to fill the vacant seat.

Mechem was one of six Senate Republicans who voted against the final passage of the [[Civil Rights Act of 1964]].<ref>[https://www.govtrack.us/congress/votes/88-1964/s409 HR. 7152. PASSAGE.]. ''GovTrack.us''. Retrieved May 9, 2021.</ref> He ran for a full Senate term that year, losing in the general election to Joseph M. Montoya by nine percentage points.<ref>[https://www.ourcampaigns.com/RaceDetail.html?RaceID=29031 NM US Senate]. ''Our Campaigns''. Retrieved May 9, 2021.</ref>

Mechem was one of six Senate Republicans (the others being [[Barry Goldwater]] of [[Arizona]], [[Bourke Hickenlooper]] of [[Iowa]], [[Milward Simpson]] of [[Wyoming]], [[Norris Cotton]] of [[New Hampshire]], and [[John Tower]] of [[Texas]]) who voted against the final passage of the [[Civil Rights Act of 1964]].<ref>[https://www.govtrack.us/congress/votes/88-1964/s409 HR. 7152. PASSAGE.]. ''GovTrack.us''. Retrieved May 9, 2021.</ref> He ran for a full Senate term that year, losing in the general election to Joseph M. Montoya by nine percentage points.<ref>[https://www.ourcampaigns.com/RaceDetail.html?RaceID=29031 NM US Senate]. ''Our Campaigns''. Retrieved May 9, 2021.</ref>

He missed 10% of all roll call votes during his short Senate tenure.<ref>[https://www.govtrack.us/congress/members/edwin_mechem/407612 Sen. Edwin Mechem]. ''Our Campaigns''. Retrieved May 9, 2021.</ref>

He missed 10% of all roll call votes during his short Senate tenure.<ref>[https://www.govtrack.us/congress/members/edwin_mechem/407612 Sen. Edwin Mechem]. ''Our Campaigns''. Retrieved May 9, 2021.</ref>