Be that as it may, Nate Silver is actually thoughtful, articulate, and well-reasoned - three words which do not describe /r/politics, etc.
It's not just a matter of which opinions one holds; it's a matter of how intelligently one expresses them and defends them with data and evidence.
(The irony with Reddit's love of FiveThirtyEight - and with the right-wing criticism of FiveThirtyEight being 'partisan' during the 2012 election cycle - is that Nate Silver is not himself an entirely left-wing person as much as people often thing. You'd have to dig pretty deep back into the archives of pre-NYT FiveThirtyEight to notice this, but he holds rather somewhat moderate or right-wing views on a number of issues).