No, it's not the US Presidential seal...it's the Obama for America logo.
Obviously there are some differences, such as the outer wording: "Obama for America" and "www.barackobama.com" and in place of a shield over the eagle's chest, there is the trademark Obama "O".
But, the most impressive difference (as a lover of the latin language) is the motto: "vero possumus" - and I'm sure you can guess the translation.
Though, following the amount of nominees, work, debate, and votes cast during the months of the primary season, it may be said that Obama's logo could adopt the motto from the US Presidential logo "e pluribus unum" - "Out of many, one"
...but, who knows what will happen at the convention!
"Yes we can"