In the months before she began her second run for the White House, Clinton spent hours quizzing economists, lawyers, educators and activists about everything from executive compensation to the latest research on lead paint. [...] introduced: proposals for paid family leave, free community college, universal pre-kindergarten, lowering student debt and job retraining. [...] to come: ideas about taxes, climate change, education, wages, Wall Street and business regulations, which she's given the more politically palatable name of "corporate responsibility." [...] while Clinton consulted progressive champions, including Columbia University economist Joseph Stiglitz and New School labor economist Teresa Ghilarducci, she's also talked with Democrats with close ties to Wall Street, such as former Treasury chiefs Robert Rubin and Larry Summers. [...] Clinton's research has continued in meetings, phone calls and emails with individual and larger groups of unpaid, informal advisers. Harvard Professor Raj Chetty, an expert on social mobility, guided Clinton through slides on research into how children in certain areas of the country are more likely than others to get ahead.