“Its possible I suppose that the media are deliberately misstating the level of Obamas support”
New Hampshire:
Ras: Obama +7.0
Final: Clinton +2.6
California:
Ras: Obama +1.0
Final: Clinton +9.6
Texas:
Ras: Obama +1.0
Final: Clinton +3.5
2008 Zogby Polls:
NH Primary - Obama by 13 (actual result: Hillary by 3)
CA Primary - Obama by 13 (actual result: Hillary by 10)
Virginia, for instance, Ras as you call them had Obama up by 18. He won by 28%. All 4 polls were low, averaging +17, more than ten points lower than Obama actually did.