Gun control rationally would not be a large concern. We have plenty of issues, including the ones you meantioned. Problem is, those issues are difficult. Really, the President cannot fix the economy. The best he can accomplish is not make it worse. At which point, he might look for an 'easy' legislative win. Something to test the waters and rack up some points with his alleged base. It could be any one of a number of pet issues. Environment, gun control, preventing drilling, whatever. We can only hope his trial run is not our pet issue. It's highly unlikely he'd try going too far his first attempt. He might attempt an AWB, high cap ban or ammo tax, but not a complete and comprehensive ban. If the trial run was successful, he'd try to violate Heller, just to see if he could.
As Chris pointed out, if your rep or Senator is somewhat anti, ask why the heck he/she is supporting a dog'n'pony show instead of fixing the economy. If your Congresscritter is somewhat pro, meantion potential lost revenue from sales, FAET (the excise tax on guns and ammo), highly paid machinists going out of work and the impact on small businesses.
Best we can hope is that with his extremely long laundry list of Wants, it keeps him busy enough to ignore us. I'll bet $1 to the first taker that Obama's first testing of the water is not an AWB, but rather the Employee Free Choice Act. It's a rigged bet of course, Obama co-sponsored the bill and quietly has been pressing for it. If he gets the bill passed, the unions will support him regardless of any future actions for several years. Short version, EFCA rigs unionization of a workforce heavily in favor of the unions. It would replace the current secret ballot election (basically the same system as voting) with card check. Allows the union to know specifically how you're voting, and would allow for targetted intimidation amoung other things.
If the EFCA fails, Obama will be more cautious and businesses won't be crippled. Hopefully it gets the federal dems squabbling as well. If EFCA passes, within six months, expect unions to explosively grow. Most likely at dear cost to industry.