As it turns out, 100 billion.
Fixing US broadband: $100 billion for fiber to every home

A pile of money.
But to put it into perspective, Microsoft just offered almost half as much for Yahoo!

When/if this is done, optical media distribution can be declared dead.

Good read. Don't skip the links in that article.

Diogen.

EDIT: Bush actually does have a plan
We have a broadband strategy? Bush administration says "yes" in cheerleading report
But it would probably be the next administration that would call his plan what it deserves and do something about it.