Considering the lashings Obama, Joe Biden, and Hillary Clinton gave each other during the Democratic primaries. Only to later have Obama make one his VP and the other his Secretary of State; and them accept the positions despite the reservations they said they had about him being President. Or did you just forget about that?
Although Clinton went a bit dirty (the 3 a.m. clip), I don't think you will find anything from Obama's side against her. He continually praised her for everything she had done. When he had lost the primaries in New Hampshire, he started his "Yes we can"-speech with the following words:
"Well, first of all, I want to congratulate Senator Clinton on a hard-fought victory here in New Hampshire. She did an outstanding job. Give her a big round of applause."
I find his campaign this year much more aggressive than 4 years ago.
