How many "defining moments" can one campaign stand

In only 3 days:

But on this January night, at this defining moment in history, you have done what the cynics said we couldn't do.

I think the [Saturday night] debate was a defining moment in this campaign because it highlighted the difference between talk and action, between rhetoric and reality.

[gearguy]

If want to get to the point real fast, go to about 10min into the first video...

Two videos to watch; watch them in order

#1
http://www.youtube.com/watch?v=Fe751kMBwms

#2
http://www.youtube.com/watch?v=CZnYzD-LnSU

Can We Fix It? Yes We Can!
Obama'2008

The US is facing a defining moment. What is at stake right now is whether we are looking backwards or whether we are looking forwards. I think it is the past versus the future.

[Aunty]

Indeed, fatty Beryl. A lot of fine words and sentiments there. But just what exactly is the man's policies? The details? The facts, the figures? The when's, where's, why's and how's? Fine sentiments are all very well, but they don't put food on the table, pay the mortgage or put men into work!