According to the Michigan Secretary of State, 1.405 million votes were cast in primary races yesterday out of 7.36 million registered through the end of July, just 56% of those cast in March.
2.5 million turned out on March 8th in the presidential primary, about 34% of registered voters, smashing an all-time record for a presidential primary set in 1972 at 1.9 million. In excess of 1.33 million of those 2.5 million votes in March were cast for Republicans vying for the presidential nomination finally secured by Donald Trump after Ted Cruz lost in Indiana.
In presidential elections since 1972, turnout nationwide has averaged 74% of those registered but just 53% of the voting age population.