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As pointed out by some in comments, it seems to be a case of reaching a conclusion and then cherry picking unrelated hit counts from different time periods to support said conclusion.
Not overtly to be sure, but how else does he explain his variety of time periods?
This could mean just about anything, or just about nothing. Even if the trend lines are accurate and valid, it could be caused by many factors. Perhaps Obama supporters are feeling less need to make the case for their candidate, while Clinton supporters need someone to talk to. Or that Clinton supporters want a community that sings their tune. The long dry spell between the last primaries and the next ones may be damping the interest in political news.
My guess is that trends in blog readership follow significant campaign or other political news, of which there will be more in the weeks to come than there is now.
