Tycoon Warren Buffett, headliner of last night’s fund-raiser for President Obama at the Four Seasons, reiterated his advice for a tax on “ultra-rich people who are paying very low tax rates.”

But the message appeared to have limited appeal to donors expected to pay $10,000 a plate; the turnout was “disappointing,” according to one guest.

An Obama fund-raising insider said the campaign has been getting resistance from some Wall Street donors from 2008 over the proposal, though Buffett said the event “went OK.”

“Warren was phenomenal,” gushed Kelly Hasslinger, 57.