Tester +9 in new Montana State University Billings Poll

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http://www.msubillings.edu/urelations/releases/2018/2018Oct23Poll.htm

From the Press Release:
MSU BILLINGS NEWS—With the U.S. Senate race drawing national attention this election cycle, incumbent Democratic Sen. Jon Tester appears to be pulling away, according to the results of the 31st Montana Poll conducted by Montana State University Billings. Tester is leading Republican candidate Matt Rosendale by a nine-point margin (47 percent to 38 percent) with two weeks left until Election Day on Nov. 6. Three percent of respondents said they would vote for Libertarian candidate Rick Breckenridge, while 12 percent are undecided.

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I guess they were decent on the final margin in 2012, although it was earlier in the month and with a seemingly high number of undecideds:

https://www.msubillings.edu/urelations/releases/2012/2012Oct11Poll-2.htm

And they skewed slightly dem in the 2016 governor and white house races:
http://www.msubillings.edu/cas/nams/polls/Montana_Poll_2016.pdf