Name: Sandy B. Ford River Twp, Michigan UP (Zone 4b) (Zone 4b-maybe 5a)
My tomatoes always get some disease later in the season, but I'm pretty sure it's either fusarium or verticillium wilt, rather than blight; hopefully someone else will have more information for you!
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion