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Senator Karen Mayne
Utah legislator profile

Years served in the Utah legislature

First session in legislature: 2008
Most recent year of service for which data are available: 2022
Total sessions served in Utah House as of 2022: 0
Total sessions served in Utah Senate as of 2022: 15

How to read the statistical profile

I present a variety of statistics about Sen. Karen Mayne's service in the Utah legislature. I highlight differences from chamber averages using little green and red arrows. The number of arrows is statistically determined. More arrows indicate a larger difference compared to the chamber average, in relation to how much diversity there is among legislators on this metric. If all legislators introduce exactly 5 bills, then a legislator who introduces 10 is very different; if legislators vary wildly in how many bills they introduce (but the average is still 5), then a legislator who introduces 10 bills may be less different from average. The standard deviation measures this diversity.

Sen. Mayne's statistical profile

Service summary. Service prior to 2007 (if any) is not shown here. My database goes back only to 2007.
  Chamber SenateSenateSenateSenateSenateSenateSenateSenateSenateSenateSenateSenateSenateSenateSenate
  District S5S5S5S5S5S5S5S5S5S5S5S5S5S5S5
Leadership NoneAsstWhipAsstWhipNoneNoneWhipWhipWhipWhipWhipWhipMinLdrMinLdrMinLdrMinLdr
Years in chamber 123456789101112131415
Years comparison LowerLowerLowerLower==============HigherHigherHigherHigherHigherHigher
Bills sponsored (learn more) Bills written and promoted by the legislator in his/her own chamber.
Introduced by Mayne 27410109111218221716171211
Chamber average
Difference -7.8-2.0-4.9-0.6+0.2-1.8+0.4+0.6+7.9+11+7.4+5.8+7.3+2.6+1.4
Comparison LowerLowerLowerLowerLower==========HigherHigherHigherHigherHigherHigherHigherHigherHigher==
Bill passage rate (learn more). What percent of Sen. Mayne's sponsored bills pass and are officially "enrolled"? (I ignore whether the governor signed or vetoted the bill.)
Bills introduced 27410109111218221716171211
Bills passed 254886991418151210107
Passage rate 100%71%100%80%80%67%82%75%78%82%88%75%59%83%64%
Chamber average 68%63%69%70%72%65%70%68%68%74%83%78%70%71%71%
Difference +32+8.2+31+9.8+8.3+1.6+12+6.8+10+8.3+4.7-3.4-11.5+12-6.9
Comparison HigherHigher==HigherHigherHigherHigher==Higher==Higher======LowerHigher==
Bills floor sponsored. A "floor sponsor" is like a secondary sponsor of a bill. After a bill passes the sponsor's chamber, its sponsor needs to find a "floor sponsor" in the other chamber to usher it through the other chamber.
Total floor sponsored 4598954733515371
Chamber average 111111111211111213131414131213
Difference -7.5-6.1-2.0-3.4-2.8-6.1-7.5-5.3-9.8-10.4-9.2+1.4-10.3-5.4-12.4
Comparison LowerLower==Lower==LowerLowerLowerLowerLowerLower==LowerLowerLowerLowerLower
Missed votes (learn more). Usually missed votes occur because of competing obligations within the legislature, not because the legislator has left the capitol.
Missed votes 1039457435447051333540275045593
Total votes held 806807786940890940840951860913926975910919931
Absentee rate 1.2%4.8%5.7%7.9%3.9%4.7%8.3%5.4%3.8%3.8%4.3%2.8%5.5%4.9%64%
Chamber average 9.6%11%12%14%9.9%11%12%12%14%10%13%11%11%8.0%12%
Difference -8.4-6.3-6.2-6.5-6.0-6.4-3.2-6.3-10.2-6.6-8.8-8.4-6.0-3.1+52
Comparison LowerLowerLowerLowerLowerLowerLowerLowerLowerLowerLowerLowerLowerLowerLowerLowerLowerHigherHigherHigher
"Nay" votes (learn more). Most floor votes pass by overwhelming majorities, since unpopular bills get weeded out long before they reach the floor. As a result, "nay" votes are rare.
"Nay" votes 493941515133305144403545294312
Total votes held 806807786940890940840951860913926975910919931
"Nay" rate 6.1%4.8%5.2%5.4%5.7%3.5%3.6%5.4%5.1%4.4%3.8%4.6%3.2%4.7%1.3%
Chamber average 4.1%4.1%4.6%3.4%4.8%3.7%3.6%4.8%3.7%2.8%3.2%2.7%2.5%4.0%2.6%
Difference +2.0+0.7+0.6+2.0+0.9-0.2+0.0+0.6+1.4+1.6+0.6+1.9+0.7+0.7-1.3
Comparison Higher====HigherHigher======HigherHigher==HigherHigherHigher==Lower
Winning side rate (learn more). What percentage of the time (excluding near-unanimous votes) is the legislator on the winning side of a floor vote?
Winning side rate 46%49%49%29%49%59%73%61%55%50%64%46%54%51%64%
Chamber average 69%70%70%72%70%69%67%68%67%68%68%70%71%70%71%
Difference -23.1-21.0-21.6-42.9-21.1-9.3+5.8-7.7-12.0-17.9-4.4-24.6-17.2-18.6-6.6
Comparison LowerLowerLowerLowerLowerLowerLowerLowerLowerLowerLowerHigherLowerLowerLowerLowerLowerLowerLowerLowerLowerLowerLowerLower
Ideology score (NOMINATE method) (learn more). Using W-NOMINATE algorithm developed by Congressional scholars, I calculate each legislator's relative ideology after each General Session. I describe the method here. Scores have no intrinsic meaning. They are only relative: A legislator with a higher score is to the right ideologically of a legislator with a lower scale. Scores may be compared only within a single chamber and a single year. In most years, a conservative Republican will have a score above 0; a score close to 100 is extreme.
Contact me for scores. They get misinterpreted often enough that I now provide them only to political scientists.
Party support score (overall) (learn more). How consistently does Sen. Mayne support his/her party? That is, what percentage of the time does the legislator vote with the majority of the other members of his/her party? Scores are usually easily above 90%.
Score (overall) 98%98%99%98%98%99%99%98%99%98%98%100%99%99%98%
Chamber average 97%97%97%98%96%97%97%96%97%98%97%98%98%97%98%
Difference +1.1+0.7+1.7+0.2+1.5+2.0+2.1+2.2+1.9+0.6+0.9+1.4+1.1+1.5-0.1
Comparison HigherHigherHigherHigher==HigherHigherHigherHigherHigherHigherHigherHigherHigherHigherHigherHigherHigher==
Party support score (party-line only) (learn more). This is the same as the "raw" party support score, but we look only at party-line votes when calculating this. A "party-line" vote occurs when the majority of Democrats votes against the majority of Republicans. Although party-line votes are rare, looking at the legislator's party support score in this setting can be revealing.
Score (party-line only) 88%75%91%77%78%86%80%79%87%76%73%93%88%83%68%
Chamber average 85%89%89%91%88%85%84%83%87%86%85%92%91%88%92%
Difference +3.0-14.5+2.7-14.4-9.9+0.7-4.1-3.4-0.6-10.9-12.5+1.4-3.0-5.5-23.4
Comparison HigherLowerLowerHigherLowerLowerLowerLower==Lower====LowerLowerLowerLower==LowerLowerLowerLowerLower

Votes on Sen. Mayne's bills

Many votes have been held on bills sponsored by Sen. Mayne. In the interest of space, I display only the most and least divisive votes held on Sen. Mayne's bills.

Sen. Mayne's most divisive bills

Listed below are the 10 votes on bills sponsored by Sen. Mayne that had the closest vote margin (as a percent of the total votes cast). When there are ties, I list the most recent bills first.

Year Sponsor Bill Ayes Nays Margin
(as % of total votes)
Type of vote
2020 Mayne SB0198 12 15 11% Senate/ failed
2015 Mayne SB0127S01 15 12 11% Senate/ passed 2nd reading
2013 Mayne SB0118 14 11 12% Senate/ failed
2019 Mayne SB0043S02 41 32 12% House/ passed 3rd reading
2010 Mayne SB0013 40 31 13% House/ passed 3rd reading
2020 Mayne SB0213S01 42 32 14% House/ passed 3rd reading
2018 Mayne SB0030S01 39 29 15% House/ passed 3rd reading
2010 Mayne SB0012 15 11 15% Senate/ concurs with House amendment
2017 Mayne SB0102 41 27 21% House/ passed 3rd reading
2020 Mayne SB0198 17 11 21% Senate/ passed 2nd reading

Sen. Mayne's least divisive bills

Listed below are the 10 votes on bills sponsored by Sen. Mayne that had the widest vote margin (as a percent of the total votes cast). When there are ties, I display the most recent bills first.

Year Sponsor Bill Ayes Nays Margin
(as % of total votes)
Type of vote
2022 Mayne SB0258 67 0 100% House/ passed 3rd reading
2022 Mayne SB0258 25 0 100% Senate/ passed 2nd & 3rd readings/ suspension
2022 Mayne SB0215S01 74 0 100% House/ passed 3rd reading
2022 Mayne SB0215S01 24 0 100% Senate/ passed 3rd reading
2022 Mayne SB0215S01 25 0 100% Senate/ passed 2nd reading
2022 Mayne SB0213S01 25 0 100% Senate/ passed 2nd reading
2022 Mayne SB0137S03 22 0 100% Senate/ concurs with House amendment
2022 Mayne SB0137S03 68 0 100% House/ passed 3rd reading
2022 Mayne SB0137S03 24 0 100% Senate/ passed 2nd reading
2022 Mayne SB0124 68 0 100% House/ passed 3rd reading