When news broke that U.S. Sen. Arlen Specter, R-Penn., had officially reversed his position on legislation he once co-sponsored making it easier for labor unions to organize, a prediction from Iowa’s senior senator seemed to be proven right.

Two weeks ago, Iowa Republican Sen. Charles Grassley said the bill, known as the Employee Free Choice Act (EFCA), would never become law because his fellow Republicans would filibuster it. That contradicted Iowa’s Democratic senator, Tom Harkin, who said the measure would have the 60 votes necessary to overcome the filibuster.

Many believe the Democrats’ hopes of passing EFCA rested with Specter, a moderate Republican who has long been seen as essential to reach the magic number of 60 votes needed to overcome Republican filibusters. Specter was one of three Republican who supported President Barack Obama’s economic stimulus package and one of eight to support the federal omnibus appropriations bill.

Grassley said there are “41 Republicans sticking together against it,” and Specter’s change of heart seems to have made that statement a reality.