By Steve Wittich Good morning from the tower at Portland International Raceway, where over the next two days, the NTT INDYCAR SERIES will get a little closer to determining the season-long championships.   Up for grabs are the overall driver’s championship, the rookie championship, and the manufacturer’s championship.  Saturday’s schedule is as follows: TIMEEVENT6:44amSunrise8:45amGates Open9am -…