skip over whitespace in same column

[Albert Reiner <areiner@tph.tuwien.ac.at>]

Hi,

is there a command to move point down (or up) over all lines where
there is whitespace in the column of point?  E.g., invoking that
command on the  "I" of the starting "IF" would get me to the "E" of
"END IF" in the following:

,----
| IF (whatever) THEN
|   foo
|   bar
| END IF
`----

C-h a column RET did not return anything that looked useful to me.

Thanks in advance,

Albert.