But only 14.8% of the nation is liberal. Can't rule with numbers like that... unless you are a dictator.
What he was writing was: 51% of those polled were Democrats. 29% of those polled were liberal/progressive Democrats. That leaves 22% of the Democrats as moderate/conservative. That's how he came up with the 58% figure: 29% of the total population makes 58% of the Democrats when 51% of the total population are Democrats (in round numbers, of course).
Still, I agree that his figures are high for liberal/progressives and that's where I believe he's fudging the numbers. I've heard elsewhere that 15-20% is a good range for percentages of liberal/socialists. That's somewhat under half of all Democrats.
Where' was the poll taken? How was the poll constructed? How were the questions developed? Who managed the results? This is all a big moonbat exercise and only serves to show how loony they are.