First off, thank-you to Beth Kanter for bringing this to the collective twitterverse consciousness yesterday.

About a year ago, the IRS ruled on 501(c)3 linking to other sites. 501(c)3 organizations must stay politically neutral--they may not campaign, advocate, or otherwise endorse any political candidate. This means that (c)3s may not print pamphlets, engage in fundraising, and so forth in support of a candidate.