My counter-example to that would be The Daily Dish, which covers Obama, beards on men, the View From My Window, marriage equality, The Pet Shop Boys, Obama again, religion, faith, the Catholic Church, conservatism, liberalism, Mental Health Breaks, and on and on. Sullivan's diverse concerns and styles haven't diluted his "brand," a term I doubt he takes much time thinking about, and it's worth understanding why.
HIs blog is consistently in the top 20 blogs in terms of traffic. In terms of influence? I'd say it's the most influential personal blog in the world. I disagree with him frequently but read him daily.
Sullivan's definitive take on blogging, Why I Blog, here: http://www.theatlantic.com/magazine/archive/200..., which every blogger should read. Then they should read Orwell's Politics and the English Language again.
I would say to Saad: If you're going to blog about politics, your post should at least read as if you read and follow political blogs. Otherwise, it will seem inauthentic. If you're worried that it's link bait, it probably is. Still, maybe no one's commenting or sharing, but that doesn't mean they're not reading.
Social media corrupts fundamentally in this way: Everyone feels she must have a personal brand. If there is miscegenation to worry about in our world, right now, that's it.