Yes. Although charities may not contribute to a political action committee, a political party, or a political candidate, there is no regulation which prohibits a public charity from accepting a contribution from a political organization. In fact, distribution to a public charity is one of the specifically permitted ways to distribute leftover funds so that the money is not treated as personal income taxable to the candidate. For the limits on involvement in political campaigns, see Ready Reference Page: "IRS Guidance Has Not Changed on Electioneering"