runner Mitt Romney on Friday defended his personal wealth amid intensifying criticism from President Barack Obama's re-election campaign, which is trying to portray the former businessman as out of touch with most Americans. Romney, who is worth up to $250 million, would be among the nation's richest presidents if elected. His Democratic and Republican opponents have thrust Romney's success to the forefront of the presidential contest as he tightens his grasp on the state-by-state Republican nomination. “If we become one of those societies that attacks success, one outcome is certain — there will be a lot less success,” Romney said during a speech at Lawrence University. The former Massachusetts governor argued his case several days before the Republican primary Tuesday in Wisconsin. The state is a general election battleground and Romney is courting the working-class voters who are likely to play a central role next week and again in November. Obama won Wisconsin by 14 percentage points in November 2008. Though Romney grew up with wealth and privilege as the son of a Michigan state governor, he has tried to downplay his early advantages and said in Friday's speech that he took “an entry-level job” after graduating from Harvard law and business schools. “I loved cars and I was very tempted to stay in Michigan and go into the car business as he had but I knew I would always wonder if any success I had was due to my father,” Romney said. “So when I got out of business school, I stayed in Massachusetts where I went to school and got an entry-level job with the best company that would hire me.” Romney spent virtually his entire business career with Bain Consulting and Bain Capital, the Boston-based private equity firms where he amassed the fortune that has allowed him to go for more than a decade without earning a regular paycheck.