By Alexandra Ulmer ATLANTA (Reuters) -The crushing defeat of David Perdue in Tuesday’s Republican gubernatorial primary in Georgia likely delighted Donald Trump’s adversaries, who have been keeping scorecards to measure the performance of election candidates backed by the former president. Trump has weighed in on November’s midterm elections like no former president, announcing more than 190 endorsements and holding rallies with his proteges. The success of his endorsees is seen as a key sign of…