It's tax season, I'm arguing with people in another thread, and that darned poll has several variables. My brain just wasn't up to processing light frequencies into actual data. You're right, I completely missed the right side of that graph.
Worse, my brain really is tired, and I had to blink and think several times to process what I was looking at.
I have to wonder what percentage of fundamentalists are actually liberal politically, since the graph doesn't tell us (or maybe it does, and I still can't process it). I also have to wonder what their definition of fundamentalism is, and which denominations they included. It appears liberals are more likely to believe in evolution, and I would have expected that, because I link politics and religion in my mind.
What if that really is the reason, but the distinction here between fundamentalists and non-fundamentalists isn't a good enough distinction. For example, as you pointed out, you don't know too many fundamentalist liberals. I don't either. I think that poll allows the possibility that there really isn't very many. That could skew the data.
For example, if they polled 300 high school to graduate age "fundamental liberals," 143 of which believed in evolution, but they polled 6000 non-fundamental liberals, it's entirely possible that the 143 fundamental liberal evolutionists are just that 2% of liberals who happen to belong to a fundamentalist denomination but don't espouse fundamentalist views. Or the 157 fundamental liberal non-evolutionists are fundamentalists who happen to be liberal, which could be a very small percentage of evolutionists, because the graph doesn't tell us.
In other words, maybe there's a political/origins tie, but maybe it just looks like it, and without knowing polling size of the various groups, it'd be hard to tell.
And maybe I just need to get some rest. Let me know if this sounds like babbling.