From a recent action alert by the Pennsylvania Family Institute:

Attorneys for a lesbian woman who was “married” to her partner in Canada have petitioned the court to declare Pennsylvania’s marriage law to be unconstitutional. That means a single judge could, by his decision, rewrite the definition of marriage in the state to allow same-sex marriage. It was a case not unlike this one that led the high court in Iowa to legalize same-sex marriage there in 2009.

The only way to protect marriage for generations to come in Pennsylvania is a Marriage Protection Amendment...

... For the past five years, the state has considered legislation giving you the chance to vote on a marriage protection amendment, but each year the legislation has been prevented from moving forward. With this past year’s election, however, conservatives won a majority in both the state House and Senate, paving the way for the passage of marriage protection legislation in 2011.