Or, it could be signing the permanent assault weapons ban.
Or maybe signing a socialized medicine plan [complete with taxpayer-funded abortions] that Hillary, John Kerry, Teddy Kennedy and James Carville have raved about.
Or maybe it was the inundation of homosexual propaganda that filled the public schools of Massachusetts during Romney's four years as Governor.
It might have even been his use of his executive power to force the justices of the peace in the Commonwealth to perform gay marriages.
But heck, who knows, there are probably still lots of "mistakes" we'll still find out about.
Conservatives would do well to remember, though, that at the time he did all those things, Mitt Romney defended them vociferously. He didn't consider them to be "mistakes," at least until he faced pro-life, pro-family conservative presidential voters. And, many of them he still defends today, one way or another, if you sift through the ocean of spin from his paid mercenaries.
I have read his replies to those issues, the repies sound more believable than your list of spin. And who is your candidate? That would help us to see where you are coming from and make some comparisons.
“Or maybe it was the inundation of homosexual propaganda that filled the public schools of Massachusetts during Romney’s four years as Governor.”
That was going on long before Romney became Governor.