Ben Smith reports on the Sestak campaign's attempt to prevent Comcast from airing the Emergency Committee for Israel's ad:

A lawyer for Rep. Joe Sestak, attesting to the Senate candidate's pro-Israel bona fides, wrote that Sestak had "put his life on the line to defend Israel" during his years in the Navy. The letter, an unsuccessful attempt to persuade Comcast not to air an attack adfrom the Emergency Committee for Israel, aggressively makes Sestak's case on several fronts, but the suggestion that military service* in was performed "to defend Israel" is rarely heard outside conspiracist circles. "Congressman Joe Sestak is the only candidate in the U.S. Senate race who (as an officer of the Navy) was willing to put his life on the line to defend Israel," Sestak lawyer Jared Solomon wrote Comcast. "It is offensive and outrageous to suggest that he does not stand with Israel." Solomon's letter, obtaned by POLITICO,  challenges several other portions of the attack ad, including a claim that he'd helped fundraise for the Council on American Islamic Relations (his appearance was at "a portion of the event explicitly free of fundraising") and that the group had been called a Hamas "front group" ("the characterization came a year after the CAIR event").

The Emergency Committee for Israel responded with their own letter to Comcast from Executive Director Noah Pollak (accessible here).