(1) The race card - "Those who patrol the border as armed civilians are racist vigilantes. They're racist because they do not want people trespassing on their property, and they refer to these people as invaders." (How does this make them racist? No matter, just repeat the same tired line.)
(2) Class warfare - The repeal of the tax on dividends is a tax cut for - one, two, three all together now - "the rich". Allowing people to keep their own money, whether they are poor, middle class, or filthy rich.......is a tax cut for the rich. Apparently, poor people cannot benefit from this, and no middle class members participate in the stock market.
They need new lies - the old ones have not only worn thin, but they no longer apply to the issues being "debated".
Aristotle identifies "Righteous indignation" as a virtue where "Envy" exemplifies excess indignation and "Malicious enjoyment" exemplifies behavior associated with an indignation deficiency.
The liberal left would like to be seen as hovering around righteous indignation; but their use of class-envy, and malicious, tactics reveals the obvious -- a lack of virtue in their approach.
"Misery loves company" is the underlying theme in modern liberal tactics.