I may not have been paying much attention, but were? Unless you are referring to the UK?
The candidates that ran in the US aren't really socialist. At best many of the candidates advocate for expanding welfare( mostly healthcare) and raising the minimum wage, which is something many Democrats have advocated themselves.
I think people worry more about the candidates, then how many different groups will react. How will the upper middle class , businesses, older Americans, conservative Americans that are Democrats, minorities, White Americans, young Americans, the wealthy, moderates, centrist, other liberals etc. You not sealing socialism to liberals or people in the left-wing in general. You are selling socialism to Americans who by and large do not trust the government , do not like large tax increases, and believe in capitalism.