One interesting aspect of the Michigan primary is that of the 30 delegates up for grabs, only 2 are awarded on a statewide basis while the others are split evenly between the 14 Congressional Districts. This is a fairly common way that both parties have tried to make the primary contests fairer.
But is it really fair ?
Consider..
We have the 13th and 14th Districts which focus on the city of Detroit. Both are heavily black and strongly Democratic, regularly giving Democratic candidates 80-90% of the vote. So out of every 100 voters in the distrticts 10-20 at most are Republicans.
At the other end of the scale we have the 2nd and 3rd districts, which are strongly Republican and give the Republican party 60% or more of the vote.
So if you assume all districts have a roughly equal population, it would take just 11 votes to win either the 13th or 14th district. A total of 22 would win both and give you 4 delegates.
On the other hand it would take 31 votes in either the 2nd or 3rd to win or nearly 3 times as much.
Not exactly the balance the parties had hoped for.