The U.S. has historically promoted democracy with a missionary’s zeal (hardly coincidentally), but this has never once been divorced from the promotion of American business, ‘free’ markets and, from the twentieth-century onwards at least, capitalism and globalisation. Obama is 100% committed to all these agendas. He is just toning down the fanaticism - he’s already the messiah, he doesn’t need to be a very naughty boy.
Can ‘one man’ change the world? No. Don’t buy the Republican’s rhetoric. He’s not a socialist. By international standards he’s barely a liberal. He is wholly and completely in the employ of American exceptionalism and its capitalist entourage - not in a conspiratorial way … but not in a good way.