If you’ve been keeping up with Harvard Law Professor Alan Dershowitz, you know he’s recently been battering President Obama for his association with the anti-Israel group Media Matters. While Dershowitz is a Democrat who supported Obama in 2008, he’s demanded the president cut ties with the left-wing media watchdog group, whose writers have made anti-Semitic remarks.

Today, Dershowitz took it a step further, promising to turn the issue into an election matter during an interview with WABC’s Aaron Klein (via BuzzFeed):

Harvard Law Professor Alan Dershowitz, a leading Democratic lawyer who takes a hawkish line on Israel, has declared a personal war on the liberal group Media Matters, which has branched out into sharp criticism of Israel.

“Not only will [the Media Matters controversy] be an election matter, I will personally make it an election matter,” Dershowitz, a professor at Harvard Law School, told WABC’s Aaron Klein today. …

“I don’t know whether President Obama has any idea that Media Matters has turned the corner against Israel in this way,” he said. “I can tell you this, he will know very shortly because I am beginning a serious campaign on this issue and I will not let it drop until and unless [writer and activist MJ] Rosenberg is fired from Media Matters, or Media Matters changes its policy or the White House disassociates itself from Media Matters.”

Dershowitz launched his campaign today with a column denouncing Media Matters’ use of the term “Israel Firster” in the New York Daily News. The law professor has successfully battled left-wing anti-Israel groups in the past, including J Street. Here’s what Dershowitz had to say about J Street during a debate with its president, Jeremy Ben- Ami, last year:

“The reason you have to attack me is very simple: I am J Street’s nightmare. Let me tell you why. Because I am a liberal Democratic Jew who strongly opposes the settlements, who strongly favors a two-state solution, who supports Obama, who supports Hillary Clinton, who supports Petraeus, but who does not support J Street. You have to create the illusion that everybody against J Street is a member of the right, and is part of the Sarah Palin-Rush Limbaugh group. And you can’t explain me.”

A vocal campaign against Media Matters, especially if it includes other prominent Democrats in the Jewish community, could cause major problems for Media Matters and increase pressure on Obama to distance himself from the group.

But it will also be a test of whether Democrats are willing to call out anti-Semitism and Israel-bashing within their own ranks. After former AIPAC spokesman Josh Block criticized Media Matters staffers for making anti-Semitic comments late last year, the Truman Institute cut its association with him, claiming Block was trying to shut down “honest debate.” Will Democratic Party institutions side with Dershowitz on this issue? Or will they continue to stay silent on the uncomfortable but very real Israel problem at Media Matters?