The large sums that Peer Steinbrück, the Social Democrats'designated candidate for chancellor, receives for speaking engagements has reignited debate about politicians'extra sources of income. How much should German MPs be allowed to earn on the side, and for what? Few people want a parliament comprised solely of professional politicians, but where should they draw the line? Read More: http://www.dw.de/program/people-and-politics/s-3217-9798