No, I think most of them came over and supported Romney. However, he had little appeal to independents who simply could not relate to the guy and his campaign did not, as far as I could see, look aggressively for potential unregistered GOP voters and get them registered and to the polls - the way Rove did in 2000 and 2004 and the way Obama did with similar potential Dems in 2008 and 2012.
Unfortunately, there were about 2-3% that stayed home, or voted third party as some kind of "protest" or stand for purity as well as a few who couldn't abide a Mormon as president. There are a fair amount of posters here that regularly trumpeted their views, even after FR came to its senses, they are a fair representation of those that didn't show up.
I have to say, there were a lot of reasons for the loss, but that one sticks in my craw. These people continue to crow about their "purity" on FR, while we watch the consequences of the dems destruction on all of us. They bitch and moan about our powerlessness to stop the slide, and the irony and horror of what they did (or didn't do) doesn't even dawn on them.