There are conservatives who lie, and there are liberals who lie, but both conservatism and liberalism hold truth to be a supreme value.

This is not true for leftism. - Truth is simply not a left-wing value.

Top Left Wing Lies of 2020, in no particular order:

America is a racist society.
This is the greatest national lie since the medieval blood libel, in which Christians accused Jews of slaughtering Christian children to use their blood to bake matzo for Passover. America is, in fact, the least racist country in history. That's why, for example, there are so many race hoaxes; the real thing is so hard to find. Jews didn't need to concoct anti-Jewish hoaxes to prove there was widespread anti-Semitism in Germany in the 1930s.

It is fair when males who identify as females compete in girls' and women's sports.
In Connecticut, two biological men who are trans women have combined to win 15 girls state indoor or outdoor championship races since 2017. According to The Wall Street Journal, "19 state athletic conferences ... allow athletes to compete based solely on their expressed gender identity." No one with a passing acquaintance with truth could say this is fair.

To be colorblind is to be racist.
This left-wing assertion is the opposite of the basic liberal ideal to end racism: to have everyone colorblind, meaning we are all to view and judge people solely as individuals irrespective of race. "Colorblind is racist" is not just a lie; it is an Orwellian lie. But it is actually normative on the left. See, for example, "Color-Blindness Is Counterproductive" (The Atlantic, Sept. 13, 2015) or the book "Colorblind Racism" by Meghan Burke, associate professor of sociology at Illinois Wesleyan University.

The Trump 2016 campaign colluded with Russia to win the election.
This lie has permeated the American media for more than three years. There was never any truth to it. But those on the left -- the Democratic Party and the mainstream media -- found it a very useful claim, and they are doing so again in the 2020 campaign.

President Donald Trump said there were "very fine" Nazis.
This is "the Charlottesville lie." First, the media spread it, and now Joe Biden has run with it, claiming repeatedly that this was the reason he decided to run for president. Of course, what Biden said is a lie; he has wanted to run for president all his life. At Trump's press conference on Aug. 15, 2017, right after the Charlottesville march and demonstrations, Trump made it clear he wasn't referring to the neo-Nazis when he said there were "very fine people on both sides." He told the press, "I'm not talking about the neo-Nazis and the white nationalists because they should be condemned totally." He was referring to the two sides at the protest over statues. See the video "The Charlottesville Lie" by former CNN reporter Steve Cortes at PragerU.com.

Donald Trump was a dictator.
This lie has been told since before Trump was elected. It is repeated by virtually every left-wing commentator and politician. See, for example, "10 Ways Trump Is Becoming a Dictator, Election Edition" by Harvard professor Stephen M. Walt (Foreign Policy, Sept. 8, 2020) or "Donald Trump Wants To Be a Dictator" by Guardian columnist Jonathan Freedland (The Guardian, July 5, 2019). It is a lie. The fact is no conservative American politician is a likely dictator because one of the fundamental goals of American conservatives is to shrink the power of the government. A dictatorship in America is far more likely to come from the left, which seeks to massively increase government power. For example, as reported in Politico on Aug. 21, 2020, Biden has already pledged, "I would shut it down," referring to the American economy and Americans' freedom of movement to combat the COVID-19 virus.

Credit:

Dennis Prager - Oct 20, 2020
https://townhall.com/columnists/dennisprager/2020/10/20/america-is-drowning-in-the-lies-of-the-left-n2578405