I think on the fringe the right is more targeted and outright with antisemitism and hatred no doubt. However when you are looking at both parties Antisemitism is closer to the heart of the democratic party, and the core platform. Look no further than Keith Ellison who was the front runner to head the DNC being associated with known Anti Semitic groups and has been on record making antisemitic comments as recently as 2010.
Also the hard right antisemitic fridge has remained constant in numbers, while on the left we have seen a dramatic rise through the mainstreaming of populist/progressive ideologies.
Can you provide a source?