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The writer, of New York, is a former Nebraska governor and U.S. senator.

Delusions fascinate me in part because I have so many of my own. Most often delusions are harmless. Sometimes they are not.

At the moment my fellow Democrats are suffering from two that are harmful. The first is that Americans long for a president who will ask us to pay more for the pleasure of increasing the role of the federal government in our lives. That this is a delusion can be seen in the promises made by six successful Democratic candidates in Wisconsin, Pennsylvania and Michigan: three governors and three senators. Not one of them supported the Green New Deal, a tax on wealth or “Medicare for all.”

The second Democratic delusion is that Americans were robbed of the truth when Special Prosecutor Robert Mueller and Attorney General William Barr concluded that President Trump did not collude with Russia in 2016. All evidence indicates that the full report will not change the conclusion that Donald J. Trump did not collude with Vladimir Putin to secure his victory in 2016.