The Washington Post RSS feeds have some issues which involve empty articles in the index, causing the parser to crash. I've opened a ticket, and in the mean time the following code added to the recipe will work around the issue.
Code:
def preprocess_html(self, soup):
for tag in soup.findAll('font'):
if tag['size']:
if tag['size'] == '+2':
if tag.b:
return soup
return None