Last Friday was dress-down day at Charles Carroll High School in Port Richmond — a day for students to leave their uniforms at home and wear whatever they liked.

One young woman chose to wear a shirt showing her support for Gov. Mitt Romney’s presidential candidacy.  Her geometry teacher didn’t like it, the girl’s father said on a radio call-in show on IQ 106.9 FM today.

The teacher allegedly told the girl to take off the shirt, saying it was like wearing a Ku Klux Klan sheet. The teacher allegedly threatened to use a marker to cross out Romney’s name and that of Rep. Paul Ryan, his running mate.  The teacher also allegedly tried to throw the student out of class.