Whether Weiner is on the ballot or not, I expect the RATs would run a Jewish candidate (or at least an pro-Isreal candidate) because of the large Jewish population of the district. Given how much of the Dem's activist base is vocally anti-Jewish, running a pro-Palestinian & "all troops out of the middle east" candidate would probably cause a sizable split in the Democrat vote. I agree with post #30, we could pull a NY-26 in reverse if we started to recruit fake third party left-wing candidates now. That district has always been GOP vs. Dem races, they've had a vocal Green/Socialist/Communist Party candidate playing a factor. The idea of running someone on the "Anthony Weiner Party" line on the ballot is hilarious as well. We won HI-1 when the Democrat vote was split between two candidates, we could certainly do the same in NY-9.
Your senario would be a good one and I hope that Republicans would be wise enough to lure a third-party leftist into the race. Former NYC Councilman Noach Dear would be a good candidate in such a case. I can’t think of any other Republicans who could win.