Obama has not shown any sign that he knows how to handle the economy, so we may as well give Mittens a try. I understand the "well he might not do any better!" argument, but we know what Obama can do and as part of this generation, I want to give someone else a chance. If Romney fails we will try it again in 4 years with Hillary and Bill.
Just giving someone a chance is not a good enough argument in my book, especially if they are promising to do irresponsible things like increasing military spending while the budget deficits are so high. I also don't think you can blame the gridlock in Washington solely on Obama, can you? Not with those tea party Republicans hanging around. I think Boehner is a good guy, and if Cantor and those tea party Republicans weren't in the equation, we likely could have got a deal back in 2011. And just the general populist "the economy ain't good so im'a throw out the incumbent" argument most certainly will not fly with me. I think the lack of a budget deal is the right place to attack Obama, but in my opinion he isn't solely to blame and he has shown willingness to compromise on entitlement reform, but similar willingness to compromise on taxes is rarely seen in Republicans.
Also any deal that happens needs to be bipartisan. It really does. If it isn't, it could just be overturned by the other party when they get in power, which creates uncertainty, and that is what we really need to avoid. Also Europe needs to get it's act together and all that good stuff.