Middle Class Success Act - Expresses the sense of the Senate that Congress should: (1) support middle class tax relief; (2) help families afford the cost of college and improve opportunities for a secure retirement; (3) invest in infrastructure and other measures to create good, well-paying jobs; (4) help ensure that families have access to affordable child and elder care; (5) preserve and improve affordable health care; (6) ensure that all workers earn enough to meet basic living standards and do not live in poverty; (7) ensure that tax dollars do not support companies that break the law or mistreat their workers; (8) keep Social Security's promise and block proposals to privatize the program; (9) ensure that families have access to a healthy and clean environment, including access to safe drinking water; (10) ensure that workers can secure representation without employer obstruction; (11) ensure that our streets and communities are safe; and (12) address the serious housing problems facing many American families.