In a word, no.Longer answer 501c4 dates from the origin of the tax code, so 1913. 501c3 are prohibited from any electoral efforts. 501c4s can lobby on their "issues" without limit, and a minority of their effort (<50%) for specific candidates. Importantly, c4s do not have to disclose their contributors. This privacy dates again from origin, but was reinforced by the 1958 decision by SCOTUS of NAACP vs Alabama. According to this (see pg 3) the activity of c4s expanded due to social activism in the 60s. I read another article in the past week or so (but can't find the specific citation now) that said the early 2000s saw an increase in their use by Democratic-oriented organizations with the right playing catch-up in the end of the decade, and certainly after Citizen's. Does that help? yup. And in case it hasn't been noted clearly, donations to 501c3 orgs are tax deductable... but donations to 501c4 orgs are NOT.