At least two top Democratic donors are stepping forward and vowing to withhold any and all future financial contributions from any Democrats who don’t support the centerpiece of Obama’s plan: Expanded background checks.

Kenneth Lerer, a New York businessman who is chairman of, and David Bohnett, a technology entrepreneur and philanthopist based in Los Angeles, are both major financial supporters of Democratic candidates, having each given scores of large contributions over the years. They are both key players in the political fundraising world and wield influence among other donors and fundraisers.

Neither will give another dime to any Senate Democrat who does not support expanded background checks, I’m told – and both will suggest to other donors that they do the same.

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