HELENA, Mont. -

Campaign reports show spending topped a record $47 million in Montana's bruising U.S. Senate race between Democrat Jon Tester and Republican Denny Rehberg.
   
The candidates themselves spent a combined $21 million during the election cycle. Almost $26 million more poured in from outside partisan committees, industry groups and unions.
   
The total amount blows past Montana's previous campaign spending record from 2006, when Tester beat incumbent Republican Conrad Burns. Candidate spending in that race totaled $14 million.
   
Tester spent $13.1 million this time, culminating in an Election Day victory and another term. Rehberg spent $8.3 million.
   
Yet the bitter tone of the race was set largely by the outside spending. More than 90 percent of outside money went to negative advertisements and other opposition campaigning meant to tear down the candidates.