In many right-wing circles, measures promoted by Sanders and Ocasio-Cortez are viewed as radical and extreme. Also, conservatives have stated that left-wing extremism will backfire when it comes to running against President Trump. In many ways, this is similar to Biden’s assessment that moderatism is better than radical leftism.
At this time, Biden has not yet responded to the tweet from Sanders. He has also remained silent in regards of Ocasio-Cortez’s views on his candidacy.