Since you can't have government by, for, and of the people without freedom, and you can't be free if you don't have power over the government, I don't feel too bad about conflating the two. Do you have a counterexample? What non-democratic form of government do you consider free?
I guess, in a larger sense, I take it as given that a democratic and free society is a basic requirement for human progress. Do you think you'd get far with a startup in a less egalitarian society? You might, but the fact that your grandfather didn't know the right people's grandfathers is going to really weigh you down. It's only the basic assumption of equality of all people that make it possible for most to start anything new. And I do take it for granted that everyone here believes that starting new things is the way to go.
So, OK, we can posit an egalitarian, "free" society where only an elite have political power. I honestly don't believe that's an actual possibility - what's to stop the political elite from taxing you at 99% of your income as soon as they think your widget would be fun to have?
Nothing.
This probably deserves a lot more thought and space than I can fit in this margin.