Massachusetts Governor Deval Patrick, elected in 2006, is now at his lowest-ever level of job approval.

Patrick today has a 41% approval rating and a 56% disapproval rating, combining to create a Minus 15 Net Job Approval.

One month ago, Patrick was at Minus 1; two months ago, at Plus 13. Just after taking office in January of 2007, he was at Plus 24.

Full results are here. Click the “1/T” to bring up the sixteen months of tracking graphs, a SurveyUSA exclusive.

The research was conducted exclusively for Boston’s WBZ-TV. For a full breakdown of the crosstabs, discussion of changes over time, and expert analysis of what’s behind Deval Patrick’s falling numbers, be sure to read the latest from WBZ’s political analyst, Jon Keller.