Denver Broncos quarterback Tim Tebow is on the cover of Sports Illustrated this week. It's Tebow's second cover in three weeks.The Nov. 28 issue showed the Denver Broncos on the field a second after Tebow had taken a snap. The headline read, "Sport in America: Courage, Integrity, Fair Play, How We Define Ourselves In Our Games," with a subheadline that said, "Tim Tebow Demands..."The Dec. 13 cover story features Tebow on the field with the headline, "Tebow! Amazing, Incredible, Phenomenal, Mind-Blowing, Incomprehensible, Unbelievable..."The December story is about how "Tim Tebow has led the Broncos from 1-4 to the division lead with the craziest, most unlikely eight-week run in NFL history."Even before the Broncos beat the Chicago Bears in overtime 13-10, the Chicago Bears general manager Jerry Angelo was telling the SI writer, "There isn't anyone like him [Tebow].""I've always believed that 60 percent of evaluating quarterbacks is based on intangibles, and he has all the ones you'd want," said Angelo.After the victory, even Broncos players couldn't explain the win."I don't think words can describe it," said Royal."I've never seen anything like it," said cornerback Champ Bailey. "Overtime game after overtime game. Three-point games and last-second field goals. I mean, when does that ever happen week after week? It doesn't. But I'll take it any way we can get it."After the Broncos' win Sunday, Denver Broncos offensive coordinator Mike McCoy hugged Tebow and said, "You kept believing! You kept believing!"Tebow has now been on eight SI covers; six as a collegian, two in the NFL. The Broncos have 21 covers to their name.