But the real bile has been saved for those conservatives who have balked at the selection of Sarah Palin.
In addition to Mr Frum, who thinks her not ready to be president, Peggy Noonan, Ronald Reagan's greatest speechwriter and a columnist with the Wall Street Journal, condemned Mr McCain's running mate as a "symptom and expression of a new vulgarisation of American politics." Conservative columnist David Brooks called her a "fatal cancer to the Republican Party".
The backlash that ensued last week revealed the fault lines of the coming civil war.
Rush Limbaugh, the doyen of right wing talk radio hosts, denounced Noonan, Brooks and Frum. Neconservative writer Charles Krauthammer condemned "the rush of wet-fingered conservatives leaping to Barack Obama", while fellow columnist Tony Blankley said that instead of collaborating in heralding Mr Obama's arrival they should be fighting "in a struggle to the political death for the soul of the country".
During the primaries the Democratic Party was bitterly divided between Barack Obama's "latte liberals" and Hillary Clinton's heartland supporters, but now the same cultural division threatens to tear the Republican Party apart.
Jim Nuzzo, a White House aide to the first President Bush, dismissed Mrs Palin's critics as "cocktail party conservatives" who "give aid and comfort to the enemy".
He told The Sunday Telegraph: "There's going to be a bloodbath. A lot of people are going to be excommunicated. David Brooks and David Frum and Peggy Noonan are dead people in the Republican Party. The litmus test will be: where did you stand on Palin?"
But the best quote in this UK Telegraph piece was this one from Nuzzo:
"Win or lose, there is a ready made conservative candidate waiting in the wings. Sarah Palin is not the new Iain Duncan Smith, she is the new Ronald Reagan."
No doubt Palin is already the GOP frontrunner for 2012. (Sorry, Mitt.) Guess we'll be seeing the Republican Party finally decay into all-out right-wing populism. Which means: It's gonna get real ugly over the next four years.
For weeks, Republican presidential candidates have been a running a gauntlet of ever-more draconian pledges put forth by party purists. Grover Norquist's anti-tax oath, the Susan B. Anthony List anti-abortion manifesto , the "Marriage Vow" Read more...