Karen...if you did not believe you were breaking rules, then you woul not have been afraid. I took your conern as knowledge of the fact. I do believe that you KNOW it is breaking the rules. But just in case you not sure which I do not believe for a second, I provide information for you from the Florida Education Agency:

http://www.feaweb.org/page.aspx?a=2896:

"Make Sure You Know What’s Prohibited At School

It is equally important to remember that there are higher standards for educators and what they can wear to schools. In a recent question, we were asked could teachers wear political paraphernalia in school (T-shirts, hats, buttons, etc.)? Don’t I have 1st Amendment rights?

The answer is NO. A teacher actively engaged in classroom instruction can not wear a T-shirt (or button, etc.) in support of a presidential candidate. Wearing a political button is the type of advocacy that a school governing authority may restrict in instructional settings because of the power and influence teachers have within their classrooms when they are teaching students.

Though the First Amendment applies, the application of the First Amendment to a public school teacher during classroom instruction (work hours) is much different than that of a private citizen. This is because the speech may be interpreted to bear the stamp of approval of the school (the school must remain neutral on matters of political controversy); and the teacher has substantial influence over the students.
Government, in its role as government, is severely restricted by the First Amendment from placing restraints on speech. But when government acts as an employer, the constraints of the First Amendment are less severe and must leave government free to impose reasonable restrictions on its employees in the interest of safe, efficient, and harmonious delivery of services to the public.

We provide this additional as a reminder that November 4 is a regular work day and this second note still applies to your regular conduct and apparel."

I had understood this to be a national law. I could be wrong. Here in Philadelphia, teachers are prohibited form even placing a political sign on their lawn. I took your post to mean that you were knowingly violating the rules. My apologies for that, but take notice of what the FEA says: Make Sure You Know What’s Prohibited At School!