The planned launch of Space Shuttle Endeavour has been scrubbed for at least 48 hours due to problems with one of the auxiliary power units.

This means that Congresswoman Giffords and President Obama, two of the more prominent viewers will have to wait to see Gifford’s husband take the shuttle on it’s last flight (last of the Endeavour that is).

NASA tends to be fairly conservative with launches and I have to assume in this case they would be even more so.