Obama "warned" on the suprime meltdown...

According to his campaign, Obama warned about the sub-prime meltdown two years ago in a letter that no one has ever seen. There was a vote on the floor of the Senate a couple years back, a bill that could have avoided this mess, but Obama voted as he has many times, present. How did that help the situation that he states he was aware of? The Democrats were opposed to this bill, and yet he could not muster everyone together for a vote on something he supposedly knew was in trouble. The Wall Street Journal has a great article about this here.