A right-wing populist wave in Eastern Europe, lifted by Donald J. Trump’s surprise victory in 2016, has not crashed as a result of his defeat last November. But it has collided with a serious obstacle: Its leaders are not very popular. After winning elections by railing against widely disliked elites, right-wing populists on Europe’s formerly communist eastern flank, it turns out, are themselves not much liked. That is due in large part to unpopular coronavirus lockdowns, and, like other leaders no matter their political complexion, their stumbling responses to the health crisis. But they are also under pressure from growing fatigue with their divisive tactics. In Hungary, Prime Minister Viktor Orban is being countered by an uncharacteristically united opposition. In Poland, the deeply conservative government has made an abrupt shift to the left in economic policy to win back support. And in Slovenia, the hard-right governing party of the Trump-loving prime minister is slumping disastrously in the polls.