Caroline Kennedy was big, but I think the fact that Ted Kennedy endorsed him also is huge. Ted almost never endorses someone in the primary. The theme of Ted Kennedy’s speech at American University, and of Caroline Kennedy’s Times op-ed, is that Obama is John F. Kennedy’s political heir. It is pretty easy to see Ted’s attacks on 42 with lines like: we have to “to turn the page on the old politics of misrepresentation and distortion.” I was personally more moved by Caroline:

OVER the years, I’ve been deeply moved by the people who’ve told me they wished they could feel inspired and hopeful about America the way people did when my father was president. This sense is even more profound today. That is why I am supporting a presidential candidate in the Democratic primaries, Barack Obama.

Toni Morrison has added her endorsement to Obama’s collection as well. The Nobel Prize-winning author and Princeton professor wrote a letter to Obama explaining her decision, saying that “in addition to keen intelligence, integrity and a rare authenticity, you exhibit something that has nothing to do with age, experience, race or gender and something I don’t see in other candidates. That something is a creative imagination which coupled with brilliance equals wisdom.”

And, since it matters to me, “Gov. Kathleen Sebelius (D-KS) will deliver the Democratic response to the State of the Union on Monday. And then Tuesday or Wednesday, she plans to endorse Barack Obama, numerous Democratic sources said.”

But as I will be the first to admit, the big question is whether Obama can have a large enough showing in NY, NJ and CA. If not none of this will matter.