Marc Serota/Justin Sullivan/Getty Images

In this composite image a comparison has been made between US Presidential Candidates Barack Obama (L) and Mitt Romney. The November 6, 2012 elections will decide between Obama and Romney who will win to become the next President of the United States.

Yesterday, the Howard Jarvis Taxpayers association filed a lawsuit alleging that a Cal State professor used his university email address to fire off an email urging students to vote in favor of Governor Brown's Prop. 30 tax initiative.

Recently, the CEO of a tech company sent an email to employees which stated the future of the company may hinge on who they choose for president.

What are the rules when it comes to campaigning in the workplace?

For more we're joined by Thomas Ferguson, a professor of political science at the University of Massachusetts, Boston.