an optimistic tone while assailing the president's economic policies. >> for every single mom who feels heartbroken when she has to explain to her kids that she needs to take a second job and won't be home as often, for grandparents who can't afford the gas to visit their grandchildren anymore, for the mom and dad who never thought they'd be on food stamps, i have a simple message. hold on a little longer. a better america begins tonight. >> you know, romney played the prosecutorial role, if you will, that eventually falls to a running mate. tradition ago the designated campaign hitman. he made the case against obama's economic policies, even the winning line borrowed from bill clinton's 1992 campaign. >> because he has failed, he will run a campaign of diversions and distractions and distortions. it's still about the economy, and we're not stupid.