Brilliant Strategy. But what is more brilliant is yet to unfold. As predicted the Dems embraced the radicals as did the media. They have become, as planned, the face of the party. As they continue speaking it will be reveals to millions who have yet to pay attention, that they are real life socialists and anti-American. So, the slow on the uptake Dems are slowly realizing that they were outfoxed - they have two choices: 1) Do as this author suggests and throw the radicals overboard. As such, it won't be pretty, the whackjob squad won't go down without a MAJOR public nasty fight making the Dems look terrible and not attracting voters. 2) Continue to let the radicals be the face of the party and scare off voters and take down the party. This is called a classic Hobson's choice, a brilliant tactical political strategy.
I think that a choice between two bad choices is a “dilemma.”
“But what is more brilliant is yet to unfold.”
I think where President Trump is heading with all of this is to for ALL Congressional elections to be national in nature; that is the only issue is in every election in the choice between the many insane planks of the Dems “America Last” platform vs. President’s Trump’s “America First” platform, thus putting EVERY Dem candidate on the spot as to whether they do or don’t support those insane planks, and thereby alienating one portion or the other of the Dem voter base, regardless of the response from each Dem candidate ...
(summarizing your post)
“two choices (for the Democrat leadership):
1) Throw the radicals overboard, or
2) Continue to let the radicals be the face of the Democrat Party”
If they do #1, they risk splitting the party in half, possibly even with a leftist Third Party candidate running in 2020. If they do #2, then, of course Middle America will want nothing to do with them.
Bottom Line: Checkmate.