Aloha, did a little research and came up with a couple of links which may surprise both of us.
In respect to MAGAs they, at least for now, may represent a majority within the Republican Party according to this
link. the link in part states...
An NBC News poll found that 52 percent of Republicans consider themselves supporters of the MAGA movement and a Monmouth poll found it’s actually 66 percent. What does that mean for politics and governance?
As to extreme liberals in the Democrat Party
this link has this to say...
Reflecting their name, Progressive Left have very liberal views across a range of issues – including the size and scope of government, foreign policy, immigration and race. A sizable majority (79%) describe their views as liberal, including 42% who say their views are very liberal – double the share of the next largest group (20% of Outsider Left).
So in summary MAGAs represent 52-66% of the Republicans, and extreme liberals (very liberal) make up 42% of the Democrat Party if you believe the polling.
Personally, I hate labels, as in my view, many of us don't precisely fit the label on every issue. Having said that, all too many label themselves and make a stand on an issue based their self designated label.