Socialism in EU may not have the meaning you think it has, it’s very distinct from communism. It can be called social democracy, like Bernie Sanders, maybe.
For example, the previous French president was from the French Socialist Party and the current primer minister of Spain is from the Spanish Socialist Workers’ Party, and they are not radical lefties.
In this case, socialism means accepting the free market capitalism for the efficiency it may bring to the economy, but with good regulation and, mainly what the USA lack, a good social safety net (free healthcare, free education etc…).