By Nolan D. McCaskillAug 5 (Reuters) - What had been billed as a defining test of the Democratic Party's direction turned into an election-night cliffhanger, with progressive candidate Abdul El-Sayed clinging to a narrowing lead over U.S. Representative Haley Stevens in Michigan's U.S. Senate primary.

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Polls point to Abdul El-Sayed defeating Haley Stevens, suggesting his left-leaning platform and Israel critiques were not the turn-offs centrists predicted it would be.