I came across this article from the New York Observer (Oct. 22nd 2007), that claims McCain dislikes Romney, for the following reason:
What Mitt Romney Doesn't Need: A Furious John McCain
If John McCain thinks he deserved just a little better from Mitt Romney, well, it’s pretty understandable.
Five years ago, Mr. Romney’s political career was on the line. Just a week before the 2002 election, he found himself one point behind in the race for governor of Massachusetts, and his Democratic foe was about to receive some high-profile campaign assistance from Hillary Clinton.
And so Mr. Romney called in his secret weapon: Mr. McCain, who in those bygone days was the most popular national political figure in Massachusetts, where he scored a 65-11 percent favorable rating in a fall 2002 poll.
As the cameras rolled, Mr. Romney paid tribute to Mr. McCain’s “straight talk.”
"That's the kind of leadership we need in Massachusetts—not a curved talker,” he said, taking a shot at his gubernatorial rival. Mr. McCain also lent his voice to automated phone calls that flooded Massachusetts, and Mr. Romney pulled out a last-minute victory.
But now Mr. McCain and Mr. Romney are running against each other for the presidential nomination, and it’s Mr. McCain who’s calling Mr. Romney the curved talker. His exasperation has begun to boil over. In Sunday night’s debate in Orlando, Mr. McCain reacted harshly to Mr. Romney’s suggestion that his rivals are less pure conservatives than he is. [...]
The article goes on to say that in 2005, Romney called McCain's immigration plan "reasonable", but later on when they began competing as rivals, Romney began calling it “amnesty” for illegal immigrants.
You can read the rest for details, it's written by a McCain supporter I believe, so be warned. ;-) I haven't verified every detail, but it would explain a lot of things. It also touches on an accusation that has followed Mitt throughout his campaign: Flip-Flopping.
Most of these flip flopping accusations are about liberal positions Romney used to hold, which have been displaced by more conservative ones. Romney claims that with age and with his experiences as Governor, he has become more conservative as he has grown into an understanding and appreciation of the conservatism of Ronald Reagan.
Many would say this is plausible. Many say this is not flip flopping, to move from one position to another; it's only flip flopping if you move from position "A" to position "B" and then BACK to "A" again.
Mitt's detractors maintain that he pretended to be liberal to get elected as governor, and now uses conservatism to get elected as president. But his father, George Romney, was known as a moderate Republican, so many would say it is plausible he was really more liberal in his youth.
I for one can't read his mind. And even now, not all his positions would be considered conservative. While he may have become more conservative on some issues, I think of him as being overall more moderate than hard right. He has explained much of his reasoning about his positions quite clearly; some people believe him, some don't.
Neither McCain nor Romney is perfect, and I have some reservations about both of them, although I still favor Romney. I don't know which one will come out ahead in this. But whatever happens, my GUT instinct about all this is... vote for the Republican. Whichever one wins. Here is a good explanation as to why:
The GOP: what's good for business is good for America
[...] Voting for a Republican is a crap-shoot just like business - and life in general. You pick your cards and roll the dice and hope for the best - but you've made the effort to remember which cards have already been dealt and you make an educated guess.
Voting for a Democrat is not a crap-shoot. You know for sure that you're going to get more commie crap. So my educated guesses have nearly always led me to vote for Republicans. Yes, deep down inside, I have ideals and wish for politicians who understood the wisdom of the Founders' limited government Constitution but we've strayed so far off course over the centuries that just a modicum of Americanism satisfies me nowadays. [...]
That's it in a nut shell; the rest of Pat's post spells it out, and it's those very thoughts that have been nagging at the back of my mind in all of this primary political juggling. Reading it spelled out, it's like someone turned on the windshield wipers, and the view is clear once more. I can see the way forward; I'm going to vote for the Republican in November, hope for the best, and do what I can to make the best happen. That's bound to be better than the Democrats certain alternative. If you aren't certain, follow the link and see.