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Mainstream responses

Mudde and Rovira Kaltwasser suggested that to deflate the appeal of populism, those government figures found guilty of corruption need to be seen to face adequate punishment. They also argued that stronger rule of law and the elimination of systemic corruption were also important facets in preventing populist growth. They believed that mainstream politicians wishing to reduce the populist challenge should be more open about the restrictions of their power, noting that those who backed populist movements were often frustrated with the dishonesty of established politicians who "claim full agency when things go well and almost full lack of agency when things go wrong". They also suggested that the appeal of populism could be reduced by wider civic education in the values of liberal democracy and the relevance of pluralism.

What Mudde and Rovira Kaltwasser believed was ineffective was a full-frontal attack on the populists which presented "them" as "evil" or "foolish", for this strategy plays into the binary division that populists themselves employ. In their view, "the best way to deal with populism is to engage—as difficult as it is—in an open dialogue with populist actors and supporters" in order to "better understand the claims and grievances of the populist elites and masses and to develop liberal democratic responses to them".

In trying to win over populist supporters, and perhaps even some elites, liberal democrats should avoid both simplistic solutions that pander to "the people" and elitist discourses that dismiss the moral and intellectual competence of ordinary citizens – both will only strengthen the populists. Most importantly, given that populism often asks the right questions but provides the wrong answers, the ultimate goal should be not just the destruction of populist supply, but also the weakening of populist demand. Only the latter will actually strengthen liberal democracy.

Political scientists Mudde and Rovira Kaltwasser

Mainstream politicians have sometimes sought to co-operate or build alliances with populists. In the United States, for example, various Republican Party figures aligned themselves with the Tea Party movement, while in countries such as Finland and Austria populist parties have taken part in governing coalitions. In other instances, mainstream politicians have adopted elements of a populist political style while competing against populist opponents. Various mainstream centrist figures, such as Hillary Clinton and Tony Blair, have argued that governments needed to restrict migration to hinder the appeal of right-wing populists utilising anti-immigrant sentiment in elections.

A more common approach has been for mainstream parties to openly attack the populists and construct a cordon sanitaire to prevent them from gaining political office Once populists are in political office in liberal democracies, the judiciary can play a key role in blocking some of their more illiberal policies, as has been the case in Slovakia and Poland. The mainstream media can play an important role in blocking populist growth; in a country like Germany, the mainstream media is for instant resolutely anti-populist, opposing populist groups whether left or right. Mudde and Rovira Kaltwasser noted that there was an "odd love-hate relationship between populist media and politicians, sharing a discourse but not a struggle".

In certain countries, certain mainstream media outlets have supported populist groups; in Austria, the Kronen Zeitung played a prominent role in endorsing Haider, in the United Kingdom the Daily Express supported the UK Independence Party, while in the United States, Fox News gave much positive coverage and encouragement to the Tea Party movement. In some cases, when the populists have taken power, their political rivals have sought to violently overthrow them; this was seen in the 2002 Venezuelan coup d'état attempt, when mainstream groups worked with sectors of the military to unseat Hugo Chávez's government.

Another discursive strategy of mainstream parties dealing with populist actors is demonization. However, Schwörer and Fernández-García found that this practice is less common in Western Europe as usually assumed and that the center-right even refuses to harshly attack the populist radical right. In a similar vein, mainstream parties use the term "populism" to delegitimize populist actors due to its negative connotation among the public but also use the term to attack non-populist competitors.