Six inches worth of metal has become the latest battleground for the First Amendment. In nine states, drivers can honor the Sons of the Confederate Veterans with vanity license plates featuring the Confederate flag. But Texas denied the design, after a campaign by civil rights groups. Proponents say the move hinders free speech, while others say the government doesn’t have to support symbols like swastikas, and Sons can always buy bumper stickers. The hearings open the courts March seating — expect decisions and arguments all week.