# [Pip](http://github.com/dloscutoff/pip), <s>22</s> 20 + 1 = 21 bytes

    Y_@?POgMgsX(MXy)-y.g

Takes delimiter and strings as command-line arguments. Uses `-n` flag to print output values on separate lines.

                          g is list of cmdline args; s is space (implicit)
        POg               Pop the first item from g (the delimiter)
     _@?                  Construct a lambda function that takes a string and returns
                             the index of the delimiter in it
           Mg             Map that function to each remaining item in g
    Y                     Yank the resulting list of indices into the variable y

               (MXy)-y    Take the max of y minus each element in y
             sX           Space, repeated that many times...
                      .g  ... concatenated to each item in g
                          Print, newline-separated (implicit, -n flag)

And an example run:

    C:\Users\dlosc> pip.py -ne Y_@?POgMgsX(MXy)-y.g , "Programming, Puzzles" "And, Code golf"
    Programming, Puzzles
            And, Code golf