The new publishers they have signed up all seems to be political news websites which is pretty positive in the election year.
Their alexa ranking and monthly site visitors count from similarweb are given below
Boston.com – 3,744 – 8.27M
seattletimes.com – 5,127 – 14.49M
Bostonglobe.com – 7,250 – 10.9M
sltrib.com – 15,198 – 5.41M
Phillymag.com – 43,220 – 1.33M
The total site visitors are coming to around 40M. Assuming each page having 2 ads they would have added 80M impressions to their kitty