ST. LOUIS — A draft of the Democratic Party’s policy positions reflects the influence of Bernie Sanders’ presidential campaign: endorsing steps to break up large Wall Street banks, advocating a $15 hourly wage, urging an end to the death penalty. Hillary Clinton’s supporters turned back efforts by Sanders’ allies to promote a Medicare-for-all single-payer health care system and a carbon tax to address climate change, and freeze hydraulic fracking. While the platform does not bind the Democratic nominee to the stated positions, it serves as a guidepost for the party moving forward.