Gravis is still a bad pollster, but what I think is going on is a clear Orman lead, and I think a lot of Democrats are saying Orman should be up by more are using past polling by Gravis (which usually favors Republicans) but they've gotten some races right in the past (the most recent one I can think of is the Florida Democratic Primary) and this, along with all the other polls showing Orman up by single digits, should show that Gravis isn't too far off.
Three polls, I think all three PPP polls, have showed Orman with a double digit lead, and that's with loads of low-intensity voters, that is mostly younger voters and Hispanics - typically Democratic demographics (though perhaps not quite as much in Kansas) - who have still yet to tune into the race.