Josh Block, a long-time Democratic, pro-Israel activist and former AIPAC communications director, e-mails: "Of 25 competitive races in which Jstreet endorsed, their candidates lost in 14 races, including in all three Senate races." And then he unloads:

Being associated with a group that helped [Richard] Goldstone slander Israel on the Hill, that refuses to condemn his report and accusation that the leadership of Israel PURPOSEFULLY targeted civilians in Gaza, that says there's no difference between Israel defending itself and Hamas terrorism, that lies about their secret money from anti-Israel George Soros, and derives half their budget from Hong Kong -- not from American Jews as they claim -- and that lies again and again, even twisting the arm of a former Israeli MK to lie for them after she is on tape exposing their ties to Goldstone, is HAZARDOUS for one's pro-Israel reputation. ... The question candidates in competitive races will be asking themselves is this: Is it worth it to lie down with dogs if all you get is flees!? The answer, I predict, will increasingly be no, it's not worth it. Unless of course, you're not pro-Israel.

Block, mind you, is a partisan Democrat. His advice should serve as a warning to lawmakers on both sides of the aisle -- vote however you like and associate yourself with whomever you wish, but be prepared to be confronted on your record.