“The harsh Republican response to President Barack Obama’s defense of a mosque near ground zero marks a dramatic shift in the party’s posture toward Islam — from a once active courtship of Muslim voters to a very public tolerance after Sept. 11 to an openly aired sense of mistrust.

“Republican leaders have largely abandoned former President George W. Bush’s post-Sept. 11 rhetorical embrace of American Muslims and his insistence — always controversial inside the party — that Islam is a religion of peace. This weekend, former Bush aides were among the very few Republicans siding with Obama, as many of the party’s leaders have moved toward more vocal denunciations of Islam’s role in violence abroad and suspicion of its place at home.”

Here is the take by Ross Douthat, a columnist for The New York Times:

“There’s an America where it doesn’t matter what language you speak, what god you worship, or how deep your New World roots run. An America where allegiance to the Constitution trumps ethnic differences, language barriers and religious divides. An America where the newest arrival to our shores is no less American than the ever-so-great granddaughter of the Pilgrims.

“But there’s another America as well, one that understands itself as a distinctive culture, rather than just a set of political propositions. This America speaks English, not Spanish or Chinese or Arabic. It looks back to a particular religious heritage: Protestantism originally, and then a Judeo-Christian consensus that accommodated Jews and Catholics as well. It draws its social norms from the mores of the Anglo-Saxon diaspora — and it expects new arrivals to assimilate themselves to these norms, and quickly.

“These two understandings of America, one constitutional and one cultural, have been in tension throughout our history. And they’re in tension again this summer, in the controversy over the Islamic mosque and cultural center scheduled to go up two blocks from ground zero.”

So what do you make of this clash over Islam?