If I were Obama and did get elected President would I give a lot back to someone who came to endorse me at the last minute?

Possibly.

But the first people I'd be looking to help out would be the people that were with me earlier, like from day one.

"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming

Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.