HOUSTON —Michigan coach Jim Harbaugh, only a few hours after leading his team to the national championship, didn’t want to look to the past, and he certainly didn’t want to predict the future. He often has mentioned to his players the value of conducting life and playing football with your feet planted on the ground. In other words, always remaining present. And that’s where Harbaugh was Tuesday morning at a news conference at the JW Marriott, soaking in the here and now and the national title his 15-0, top-ranked Wolverines earned with a 34-13 win over Washington on Monday night at NRG Stadiu…