The first sentence just sounds and reads better to me, but both are grammatically correct.
I'd also point out that saying the first sentence would be redundant in speech, but would be used for emphasis. The sort of situation which would be most applicable would be if you in a group with multiple conversations. So you'd start off with "i say ..." to divert attention to you.
If I were writing the first sentence then I'd might put Hillary for president in quotes. This would be particularly true for the first sentence in a paragraph where I'm explaining why I want Hillary to be president.