Romney has critiqued Obama for being '"a “job killer” who is “in over his head”'; and one quote (which I can not source at the moment) has him claiming to have created more jobs as Governor of Mass. than Obama has done for the...
2012 presidential campaign
Matt's two recent posts on the myth of the 2004 elections make two crucial related points: 1)the effect of presidential campaigns in general is marginal, and 2)there's no actual evidence.