stage with hillary clinton and bernie sanders come tuesday night. >> weather vanes tend to shift in the wind. i know where i stand. >> let's start with martin o'malley. the married father of four born in washington, d.c. was tailor made for a career in politics. at only 20, he left college briefly to work on the presidential campaign of colorado senator gary hart. by 28, was ready for office himself, winning a seat on the baltimore city council. from there, his political aspirations grew. first, mayor of baltimore, then governor of maryland. ♪ but here's something you probably didn't know about martin o'malley. he's front man of a rock band. and he even used his guitar skills to tease his presidential bid. on the issues, gun control, o'malley wants stronger expanded background checks and assault weapons ban, plus a limit on the size of gun magazines. on immigration, he supports a path to citizenship.