I'm not saying there's no bias, but...
The Duke game was against Pitt, who was the top "receiving votes" team in the AP poll (#26), so a more impressive win than ISU last night (Duke also won by 29). The highlights of #6 Kentucky were of them getting upset by an unranked Georgia team. And #7 Marquette played a close game at home against unranked Georgetown where they almost got upset.
Would it be nice if they would show extensive highlights of Iowa State beating another Big 12 team by 23? Yeah, I guess. But when a top 10 team is playing a non-tournament team, the game is more likely to get covered if it's a big upset rather than if it's an expected win. So in that sense, I'm not too upset that it didn't get much coverage.