By Zach Koons The seven-time world champion is making his foray into the world of the NFL. View the original article to see embedded media. Seven-time Formula One champion Lewis Hamilton is joining the ownership group led by Walmart heir Rob Walton that is poised to complete the purchase of the Broncos next Tuesday. “We’re delighted to welcome seven-time Formula One World Champion Sir Lewis Hamilton to our ownership group,’’ Rob Walton said in a statement. “He is a champion competitor who knows what it takes to lead a winning team and a fierce advocate for global equality, including in his own…