Ricin certainly brings out the worst in people. A Texas woman has reported her husband to investigators, saying he might have sent the ricin-laced letters to President Obama, Mayor Bloomberg, and the mayor's Washington gun control group. The woman's husband has refuted the allegations, saying he was set up by his wife. Sources say the letter to Bloomberg ranted about the right to bear arms and threatened, "What's in this letter is nothing compared to what I've got planned for you." But Bloomberg is unfazed, saying Wednesday that he's "not going to walk away from those efforts."