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Senator Darin G. Peterson
Utah legislator profile

Years served in the Utah legislature

First session in legislature: 2001
Most recent year of service for which data are available: 2008
Total sessions served in Utah House as of 2008: 4
Total sessions served in Utah Senate as of 2008: 4

How to read the statistical profile

I present a variety of statistics about Sen. Darin G. Peterson'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. Peterson's statistical profile

Service summary. Service prior to 2007 (if any) is not shown here. My database goes back only to 2007.
  Chamber SenateSenate
  District S24S24
  Party RR
Leadership NoneNone
Years in chamber 34
Years comparison LowerLower
Bills sponsored (learn more) Bills written and promoted by the legislator in his/her own chamber.
Introduced by Peterson 88
Chamber average 9.69.8
Difference -1.6-1.8
Comparison ==Lower
Bill passage rate (learn more). What percent of Sen. Peterson's sponsored bills pass and are officially "enrolled"? (I ignore whether the governor signed or vetoted the bill.)
Bills introduced 88
Bills passed 53
Passage rate 62.5%37.5%
Chamber average 62.5%68.0%
Difference -0.0-30.5
Comparison ==LowerLower
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 1815
Chamber average 11.611.5
Difference +6.4+3.5
Comparison HigherHigher
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 7357
Total votes held 820806
Absentee rate 8.9%7.1%
Chamber average 8.9%9.6%
Difference +0.0-2.5
Comparison ==Lower
"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 2231
Total votes held 820806
"Nay" rate 2.7%3.8%
Chamber average 4.1%4.1%
Difference -1.4-0.3
Comparison Lower==
Influence or "floor power" (learn more). What percentage of the time is the legislator on the winning side of a floor vote?
Floor power score 78.0%75.4%
Chamber average 69.8%69.1%
Difference +8.2+6.3
Comparison Higher==
Ideology score 1 (from interest group ratings). Half a dozen interest groups release ratings of each legislator after each legislative session. I rescale them all from 0 (most liberal) to 100 (most conservative) and average them together, resulting in the numbers reported here.
Average rating 75.666.6
Chamber average 57.750.0
Difference +17.9+16.6
Comparison HigherHigherHigher
Ideology score 2 (NOMINATE method) (learn more). Using a widely accepted scaling method, I calculate each legislator's ideology score (called a "NOMINATE" score) after each legislative session. I describe the method here. Scores have no intrinsic meaning; they are useful only for comparing two legislators. A legislator with a higher score is more to the right ideologically of a legislator with a lower scale. In most years, a conservative Republican will have a score above 0; a score close to 100 is extreme.
NOMINATE score 46.763.8
Chamber average 0.45.5
Difference +46.3+58.3
Comparison HigherHigher
Party support score (overall) (learn more). How consistently does Sen. Peterson 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) 97.5%97.2%
Chamber average 96.7%97.1%
Difference +0.8+0.1
Comparison Higher==
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) 92.9%93.8%
Chamber average 83.4%84.8%
Difference +9.5+9.0
Comparison HigherHigherHigher

Votes on Sen. Peterson's bills

Only 11 bills sponsored by Sen. Peterson have come to a vote. Listed below are all votes held on bills that Sen. Peterson sponsored. The votes are sorted by vote margin, with the most divisive votes listed first.

Year Sponsor Bill Ayes Nays Margin
(as % of total votes)
Type of vote
2007 Peterson SB0155 23 6 58.6% Senate/ pass 2nd
2007 Peterson SB0155 22 5 63.0% Senate/ concurs with House amendments
2007 Peterson SB0155 22 5 63.0% Senate/ pass 3rd
2007 Peterson SB0155 55 10 69.2% House/ passed 3rd reading
2008 Peterson SB0203 24 1 92.0% Senate/ pass 2nd
2007 Peterson SB0195S02 61 2 93.7% House/ passed 3rd reading
2007 Peterson SB0143 66 1 97.0% House/ passed 3rd reading
2008 Peterson SB0120 68 0 100.0% House/ passed 3rd reading
2008 Peterson SB0120 22 0 100.0% Senate/ pass 3rd
2008 Peterson SB0120 28 0 100.0% Senate/ pass 2nd