I don’t know about this story, but in the 80s Hagman was constantly bashing Ronald Reagan. He was and probably remained very liberal. I loved the character he created and hope that he rests in peace, but he was the 80s version of Sean Penn.
Apparently Hagman was a member of the "Peace and Freedom Party" from the 1960s until his death. Yeah, the Peace and Freedom Party that just ran Roseanne Barr and Cindy Sheehan for President/Vice President.
Still Hagman seems like a nice guy who happened to be a left wing loon. Penn is an unmitigated douchebag.