I'm not saying that Romney's background will have no effect on the election. I'm saying that the personal qualities of a candidate generally have a small effect on election results, one that is easily swamped by many other factors. This is a widely held view among political scientists who study elections. This post from Andrew Gelman is pretty representative.
I'm also not saying that all candidates are the same, just that all candidates fuck up, and the fact that Romney also fucks up doesn't tell us very much. The foreign trip that you described as a goddamn disaster will be forgotten in a couple of weeks, just like any number of other news stories that broke in July or August and then evaporated after the campaign. This is still well before most people start following the election at all closely.
It barely matters now. The US generally doesn't give a shit about what foreigners think.
What it shows is his basic incompetence at the whole campaigning thing. How does one fuck up a foreign handjob tour? He couldn't hit a single country without offending the shit out of someone.
Firstly, these qualities being "fungible" doesn't make much sense.
And secondly, charisma is definitely a thing. It's a huge predictor of success in many areas even.
Favourable/Unfavourable numbers among voters are pretty skewed against Romney.
Even after his opponents dropped out of the race, a large number of primary voters wrote in Ross Perot's name. After the primary was over, both George H. W. Bush and Ross Perot had double digit leads over Clinton. And yet we all know how this story ends. Clinton wasn't just an average candidate, he was a great candidate, a political rock star whose reputation lives on more than a decade after he left office.
I'd be very surprised if Romney turned into another Bill Clinton. But if even a great candidate like Clinton can seem like a failure in the summer before an election, surely it's too soon to write off Romney as a bad candidate.
That reasoning doesn't work. It relies on the idea that Romney could somehow turn out to be a good candidate, something even you don't seem to put any faith in while arguing it.
And you shouldn't. Romney's been running for years now. We know what he's like. And if anything, he seems to have gotten worse at it the closer we get to the election.
You wanna look at 1992, let's look at 2008 where Obama led McCain from like May onward. There were the convention blips, but other then that the polls were consistent that Obama was gonna win. And this year the polls are, if anything, more consistent.