Welcome to America! In America, you are entitled to vote, or donate, to the candidate of your choice for whatever reason you choose, or no reason whatsoever. If the irrational preferences of some Jewish Republican donors are against Romney, it is no reason for him to complain. It's not like he hasn't ever tried to raise money among fellow Mormons for similiarly irrational reasons.
You're completely missing the point (as usual). We don't understand how anyone could think Michelle Bachmann was Jewish, not complaining about the preferences of Jewish donors.