He's wealthy, finances and produces his own movies (Westerns now IIRC) and everyone in Holly-weird knows he's a "Right-Wing Gun Nut" anyway so his career wouldn't be harmed.
Plus he has a big imposing figure, is good looking (not in a girlie man way) and could swing a lot of "soccer moms" to our side.
Just a thought....
Selleck would make a poor choice for President. He was completely blindsided by Rosie O'Donut. He started sputtering that he wasn't a spokesman for the NRA. Unfortunately, he could have realized how much he was being attacked and calmed down. He didn't so don't confuse Selleck with Quigley Down Under.
Any President of the NRA has to be a member of the Board of Directors. Selleck had never held that position.