• Unsympathetic candidate from the depths of the establishment.
• Focusing on virtue signaling “how can you not want a women? And now she is asian and black too!” instead of real life improvements for the affected demographics. Especially after 8 years of Obama have shown that a black president doesn’t mean much in that regard.
• Focusing on who they are not, instead of focusing who they are.
• Not opening up for a full primary, instead pushing the establishment candidate through.
• Not addressing peoples economic concerns and offering a progressive solution for that, instead sucking up to the billionaire donors
• Having a candidate that is currently involved in a war/genocide or advocating for more of it (Hillary)
• Establishing a culture of looking down on “stupid” or “backwards” rural and rust belt voters
• Sending contradictory in or mixed messages on various issues, depending on who they address/what the latest poll said to be important
• Sending a message of a sure election in their bubbles, demotivating some of their usual voters.
• Focusing on endorsements by high profile celebrities, further giving the image of a party of elites, rather than for the normal people.

Those were the bunch that came to my mind and what i remember seeing in various election streams.