HOFFER SMILES:

For the past decade, populists like Mr. Babis have often seemed politically invincible, rising to power across Central and Eastern Europe as part of a global trend of strongman leaders disdainful of democratic norms. But on Saturday, the seemingly unbeatable Mr. Babis was defeated because opposition parties put ideological differences aside and joined together to drive out a leader they fear has eroded the country's democracy.

Their success could have major repercussions in the region and beyond. In Hungary and in Poland, where nationalist leaders have damaged democratic institutions and sought to undermine the European Union, opposition leaders are mobilizing, trying to forge unified fronts and oust populist leaders in upcoming elections.

"Populism is beatable," said Otto Eibl, the head of the political science department at Masaryk University in Brno, the South Moravian capital. "The first step in beating a populist leader is to suppress individual egos and to compromise in the interest of bringing a change."

The biggest showdown could come in Hungary, where Prime Minister Viktor Orban has promoted himself as Europe's standard-bearer for "illiberal democracy," while his Fidesz party has steadily stripped away democratic checks, squeezing independent media and the judiciary. Mr. Orban has staked out right-wing political positions -- including hostility to immigration, the European Union and L.G.B.T.Q. rights (if also proving adept at adopting left-wing welfare policies) -- that have been emulated by his allies in Poland, the governing Law and Justice party.

In recent years, champions of liberal democracy have been confounded in their efforts to battle their way back into power against nationalist leaders skilled at stoking fear and presenting themselves as saviors. Faced with well-oiled and well-financed political machines, like Mr. Orban's Fidesz party or Mr. Babis's party, Ano, opposition forces have been notoriously divided -- until now.

This weekend, six Hungarian parties will complete a weekslong opposition primary race, the first of its kind, to whittle down the list of potential contenders in every electoral district to oppose Mr. Orban's party. The coalition includes groups ranging from nationalist conservatives to leftists, who disagree on most things but share a fervent desire to dispatch Mr. Orban.

In Poland, Donald Tusk, a former prime minister and European Council president, returned to Poland this summer to rally the main opposition party and people who often do not vote, and lure support from a plethora of other opposition groups.

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