Why save-excursion doesn't restore cursor position after 3 kill-line calls?

[address@hidden]

I'm trying to map C-d to a function that deletes an entire line and
stops on the *SAME* column number of the following line....

(global-set-key "\^d" (lambda () (interactive) (save-excursion (kill-
line)
 
(kill-line 0)
 
(kill-line))))

Why doesn't save-excursion preserve the column number after these kill-
line invocations?

chris