Extending voting hours in response to polling place irregularities may be appropriate, but is far from ideal. [Read Comment]
As we described in Section 3.5 of the e-Book, which covers Tax-Exempt Organizations, 501(c)(3) organizations may not intervene in an election for or against and candidate. The IRS has recently started "inquiries" to determine if certain 501(c)(3)s violated their (c)(3) status by engaging in political intervention. You can find links here to information on various actions taken by the IRS.