Read this article on Bush's Strong Arm tactics. It was pulled from the post to allow for Iraq coverage. This is, to some degree, an extension of the Esquire piece on Rove- except this Post article extends the political pressuring to the White House in general.
To me, it is sickening. Here's a bit:
"Conservative interest groups get similar pressure. When the free-market Club for Growth sent a public letter to the White House to protest White House intervention in GOP primaries for "liberal-leaning Republicans," the group's president, Stephen Moore, picked up the phone at a friend's one evening to receive a screaming tirade from Rove, who had tracked him down. On another occasion when Moore objected to a Bush policy, Rove called Richard Gilder, the Club for Growth's chairman and a major contributor, to protest.

"I think this monomaniacal call for loyalty is unhealthy," Moore said. "It's dangerous to declare anybody who crosses you an enemy for life. It's shortsighted." Leaders of three other conservative groups report that their objections to Bush policies have been followed by snubs and, in at least one case, phone calls suggesting the replacement of a critical scholar. "They want sycophants rather than allies," said the head of one think tank."