So this is the one "fact" that Biden didn't misstate?
He must have taken care to carefully memorize this because they needed an unprovable fig leaf.
But here's the deal:
1) Obama's letter was completely ineffective -- no surprise there.
2) If this is the letter, and it was really written in 3/2007, then McCain had him beat on the topic by about two years.
3) AND ... McCain actually proposed legislation; i.e., something concrete ... and BEFORE he was a candidate for president.
4) Obama just yapped, as usual -- AFTER he was a candidate for president.