We need only 1 more state legislature to ask for a Balanced Budget Amendment and then a Constitutional Convention will be held to overturn Citizens United AND pass a Balanced Budget Amendment.  That is because the Constitution DOES NOT LIMIT the topics at a Constitutional Convention.

Citizens United said that Corporations are people and that money is free speech.

That isn’t what our Founding Fathers intended.

See the following wikipedia website:
http://en.wikipedia.org/wiki/Balanced_budget_amendment
go to the History section and read the last paragraph which says the following:

Article V of the Constitution specifies that if the legislatures of two-thirds of the states petition Congress for a constitutional amendment, then Congress must call a convention for proposing amendments. Between May 8, 1957 (Indiana), and July 21, 1983 (Missouri), applications from 32 different state legislatures, were submitted to Congress on the subject of a Balanced Budget Amendment.  On October 30, 2013, the Ohio Senate adopted Senate Joint Resolution No. 5; making Ohio the 33rd state.

If one additional state legislature were to petition, then the required two-thirds majority of states would be reached (34 out of 50 states) and some contend that Congress would be required to call a convention to propose a Balanced Budget Amendment.