Democratic President Barack Obama and Republican presidential candidate Mitt Romney engaged in a rare tussle over gun control on Tuesday, and Obama opened the door to pushing for a ban on assault weapons if he wins a second term. During their second election debate, both men largely danced around a gun-control question, a reflection of how they are wary of offending voters who support gun rights. However, Obama did say that he would back an assault-weapons ban like... (GunPolicy.org)