That wasn't hard, considering he served in the chamber for 46 of his 76 years, has chaired two major committees, and has played a major or minor role in nearly every piece of significant social welfare or health legislation since the mid-1960s.

NPR: Kennedy's Illness Casts Pall over Congress

Promoting social welfare can include lobbying and advocacy for issues and legislation, but not outright political campaign activity.

WSJ: IRS Scrutiny Was Deeper Than Thought

That social-welfare activity can include lobbying and advocating for issues and legislation, but not outright political-campaign activity.

WSJ: Wider Problems Found at IRS