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Trump tested his power in last night's primaries — and won

Photo: Chip Somodevilla/Getty Images

Republicans saw a trend continue in South Carolina, where an incumbent who opposed President Trump lost his primary just one week after an incumbent congresswoman in Alabama, who was critical of the president, was forced into a runoff.

Why this matters: The president is becoming a one-man litmus test for Republicans all over the country, proving the GOP has little room for an agenda or ideas that don't align with his.