The statement contains a verifiable factual claim about trends in antisemitism and political responses. Data from the Anti-Defamation League and other monitoring groups show antisemitism has risen across the political spectrum in recent years, including on the left, though it remains more prevalent on the far right. The claim about Democratic Party leadership "looking the other way" is more interpretive, but there is documented evidence of internal Democratic debates and criticisms about how the party has addressed antisemitism within its ranks over the past decade, making the core assertion largely consistent with observable developments.

While antisemitic incidents did increase in the mid-2010s from various sources, there is no clear evidence that the rise was specifically driven by the left or that Democratic Party leadership ignored it; the claim oversimplifies a complex trend and lacks substantiation.

There is no clear evidence that antisemitism began rising specifically on the left exactly ten years ago, nor that Democratic Party leadership consciously ignored it; trends in antisemitism are complex and data do not support this precise claim.

While there have been instances of antisemitism from some individuals on the left, there's no evidence that antisemitism specifically 'began rising' on the left exactly 10 years ago, nor is there support for the claim that Democrat Party leadership systematically 'looked the other way' or 'hoped it would go away' regarding antisemitism.