Moderate Republicans should use Senator Specter’s switch as the impetus to force a re-evaluation of where our party is going — a review that can happen only from the inside. Besides, third parties in the United States don’t have a particularly successful history.

In the coming election cycle, we have the opportunity to remind the nation that our party is committed to such important values as fiscal restraint, less government interference in our everyday lives, environmental policies that promote a balanced approach between protection and economic interest, and a foreign policy that is engaged with the rest of the world. The responsibility of ensuring that the party follows the right path lies with those moderates who are willing to work to make it happen. I anticipate that centrists will convene in the coming days to discuss how we can return the party to the sensible middle.