DO ALL DEMOCRATS HATE AMERICA AND DESPISE THE UNITED STATES CONSTITUTION

I cannot answer that question with any certainty, but time will tell. 
 
We can only look at the facts and what we know for certain right now.  What we know for certain is that every current candidate for president of the Marxist/Progressive (Democrat) party absolutely hates America and the principles upon which it was founded.  We also know that every current candidate for president under the Marxist/Progressive (Democrat) Party flag hates the United States Constitution and will work to have it abolished and obliterated.
 
A principle upon which our nation was founded and strongly supported by the Constitution of the United States is that a free and independent people can only remain free and independent when government remains limited.  The more power government has, the less freedom the individual has.  The current candidates of the Marxist/Progressive (Democrat) Party for president are advocating more and more control of government over the lives of the American citizen.  They are truly advocating that the government should dictate how each citizen lives their lives and what their thoughts should be.  We are hearing more and more that hate speech (or speech with which they disagree) must be outlawed, that government must control the earnings of the individual, what an individual can and cannot own and control, what parents can and cannot teach their children, what a Christian can and cannot believe, what morals an individual can or cannot maintain, and yes even what constitutes a good person and an evil person.  Our founders specifically stated that all of the above was outside the role of government.
 
Every Marxist/Progressive (Democrat) Party candidate for president today states that individualism is bad, and collectivism is the only solution for society.  Individualism is the basis upon which our nation was founded.  Individualism is the belief that all people have received the natural rights of life, liberty, and property, or as Jefferson stated, the pursuit of happiness, from our Creator and the only role of government is to protect those rights.  Each individual is responsible for the results of their own decisions and will reap the reward or suffer the consequences of those decisions.  Every individual is encouraged to determine for themselves what happiness and success is.  Individualism is required for a free and independent society.
 
Collectivism is the believe that the individual is simply a small and unimportant clog in the group or collective and thus the goals and aspirations of the individual are always a part of and defined by the overall goals of the collective.  Collectivism is an umbrella term for Marxism, communism, socialism, and progressive and has now come to include the Democrat party.  Collectivism requires a large, dominating, and dictatorial government; a government that controls the lives, thoughts, and actions of its citizens.  Collectivism despises independent thought and requires total conformity and equality as it defines equality.   This is exactly the opposite of what of the founding principles of the United States as defined in the United States Constitution.

The Marxist/Progressive (Democrat) Party candidates have all professed their hatred for America and our Constitution.  Their proposals are to nullify and obliterate the freedoms protected by the Constitution.  If you support the Marxist/Progressive (Democrat) Party candidates, you support an anti-American agenda and the obliteration of the United States Constitution.
 
What remains to be seen is how many people who refer to themselves as Democrats will support an anti-American agenda and the obliteration of the United States Constitution.  We will know the answer on the morning of November 4, 2020.