Intuitively, that looks normal
Gore has name recognition, no one has moved out of the pack among the rest of the crowd. What's interesting is that with all Gore should have going for him, (name familiarity, won an election but lost the lawsuit, VP for 8 years) he still has only about a third of the Dems.
And I'd volunteer for GWB before I'd vote for Hillary. (I might screw up what I was doing, but I'd volunteer.)
Arf