Python 3.2 smtplib Error?

Ok, so I'm following the sample code at the Python docs for sending a simple basic email. I even created a textfile with a message in it. Anyway, I'm doing it in the Python interpreter via ssh to test it out & make sure I know what I'm doing, but when I press enter after typing the s.send_message(msg) line, I get this surprising TypeError:

import smtplib
from email.mime.text import MIMEText
textfile = 'txt4mail.txt'
fp = open(textfile,'rb')
msg = MIMEText(fp.read())
fp.close()
msg['Subject'] = "Sent using Python 3"
msg['From'] = 'xxxxxxx@zamphatta.com'
msg['To'] = 'xxxxxxxxxxxx@gmail.com'
s = smtplib.SMTP('smtp.webfaction.com')
s.send_message(msg)

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.2/smtplib.py", line 812, in send_message
    g.flatten(msg_copy, linesep='rn')
  File "/usr/local/lib/python3.2/email/generator.py", line 91, in flatten
    self._write(msg)
  File "/usr/local/lib/python3.2/email/generator.py", line 137, in _write
    self._dispatch(msg)
  File "/usr/local/lib/python3.2/email/generator.py", line 163, in _dispatch
    meth(msg)
  File "/usr/local/lib/python3.2/email/generator.py", line 385, in _handle_text
    if _has_surrogates(msg._payload):
TypeError: can't use a string pattern on a bytes-like object

I come from a PHP background & have only been learning Python for a few months, so I'm not sure what's causing the error in such a basic thing. Shouldn't the example code "just work"? So, what's going on here that I need to fix? Is there a server setting I might be unaware of? Is it possible that something I put in the textfile is causing it? I tried changing stuff in it but it didn't seem to have any affect. I'm really confused.

The textfile I created in vi, is simply this, nothing special --

Yo dude!
  I am sending this via Py3k. Test link: http://google.com, enjoy!
   - Yourself

Any ideas?