Since fisking, like Romney's talking points, are soooo 2003 I'll just sum up:
Businesses aren't holding off on investing because of some potential policy changes that haven't been passed through Congress and won't take effect for years even if they are. They're holding off on investing because we're in the middle of a fucking recession. They know that there's less being spent, so they're not going to be able to sell as much, and are cutting production as a result. This started happening way before Obama took office, and it's happened many times with no regard to the partisan affiliation of the current president.
Mitt Romney knows this. He spent time in the private sector, and fired enough people to understand how the process works. Nobody's out there saying "Gee, I was gonna build a couple new factories to sell my widgets, but because of the possibility of a cap-and-trade bill several years down the road, that doesn't even target my particular industry, I'm just going to sit on this cash!"
I mean, honestly now.