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Saturday primaries will test influence of Romney’s anti-Trump plea

Contests in Kansas, Kentucky, Louisiana and Maine will be the first since Mitt Romney urged Republicans to block Donald Trump's path to the nomination.

Republican presidential candidate Donald Trump speaks to guests during a rally at Macomb Community College on March 4, 2016 in Warren, Mich. (Photo by Scott Olson/Getty)
Republican presidential candidate Donald Trump speaks to guests during a rally at Macomb Community College on March 4, 2016 in Warren, Mich.Getty Images

Perry Bacon