The type of tax exempt status these groups were seeking are for groups that advocate for social issues. Not political.<quoted text>
Maybe he hasn't been charged because your "facts" are wrong. If lobbying was illegal-which it isn't for tax exempt charities-Red cross, ACA, AARP, et al would all be in jail.
They can do political activities but this cannot be their major endeavor.
The Red Cross advocates for their health services , they do not endorse candidates (as far as I know), and no one ran for office on the Red Cross ticket.
The AARP advocates for older people. They push issues that effect older people.