This is the most interesting part to me:

Biden’s attempt to appropriate the “MAGA” brand as a political attack was hardly accidental. It arose from a six-month research project to find the best way to target Republicans, helmed by Biden adviser Anita Dunn and by the Center for American Progress Action Fund, a liberal group.

The polling and focus group research by Hart Research and the Global Strategy Group found that “MAGA” was already viewed negatively by voters — more negatively than other phrases like “Trump Republicans.”

In battleground areas, more than twice as many voters said they would be less likely to vote for someone called a “MAGA Republican” than would be more likely. The research also found that the description tapped into the broad agreement among voters that the Republican Party had become more extreme and power-hungry in recent years.

“All of that extremism gets captured in that brand,” said Navin Nayak, president and executive director of CAP Action Fund. “We are not trying to create a new word. This is how they define themselves.”

Nayak also said “MAGA” is a versatile epithet, allowing Biden and the Democrats to convey the same message whether they are talking about the economy, climate change or abortion.

Psaki on Tuesday described “ultra MAGA” as “the president’s phrase,” saying Biden personally added “a little ‘ultra’ to it — give it a little extra pop.”

Biden has repeatedly tied the term to Sen. Rick Scott (R-Fla.), chairman of the National Republican Senatorial Committee, who in February released a controversial 11-point policy plan. Its proposals include taxing many Americans who currently pay no taxes, as well as “sunsetting” all federal laws every five years, apparently including those authorizing Medicare and Social Security.