Marco Rubio, Florida's GOP senator, unveils his reform ideas to 'modernize' the system and put illegal immigrants on a path to citizenship. Marco Rubio—41-year-old son of working-class Cuban exiles—has lived the upwardly mobile immigrant experience. In his fast rise, the Florida Republican has also experienced the politics of immigration [....] "Here's how I envision it," he says. "They would have to come forward. They would have to undergo a background check." Anyone who committed a serious crime would be deported. "They would be fingerprinted," he continues. "They would have to pay a fine, pay back taxes, maybe even do community...