Feds' involvement started either very late in GWB's Administration or early in OhBummer!'s. I am not sure GWB would have thought much about the proposed routes and extensions being entirely within CA; OhBummer! would not have cared.
IMO, the routing has been moronic, from square one. There are existing rail rights-of-way from the Land of LA, through the Coast Ranges, all the way to SF (through San Jose), and from SF to Sacto. Upgrading/expanding those would have been comparatively inexpensive and easy. The moronic route would instead go through an un-selected way across at least one earthquake fault, take a third major route - I-5 and SR99 being the first two - through Central Valley farm land, make multiple stops in several larger cities (how is that "high speed"?!!!), and then into Sacto, which is not a major business center (compared to SF and San Jose).
One of the frustrating realities of politics is that big projects garner attention and votes; "simply" maintaining and improving existing infrastructure is "boring".