Abdul El-Sayed’s Senate candidacy poses a critical test of Democrats’ ascendant progressive wing: Can an insurgent candidate, with unabashedly liberal positions, win a general election in a moderate state?

Abdul el Sayed's rise in Michigan's Senate primary is testing the Democratic Party's winning coalition as the race exposes deep ideological divisions.

Michigan’s Senate primary has become a test of progressive energy, Israel policy and big-money politics, with the winner heading to a November contest critical to the party's…