A little-known entity who bounced around from one canceled television series to another, actress Lauren Graham finally came to prominence with her breakout role as Lorelei Gilmore, the wisecracking young mother who shares a sisterly bond with her teenaged daughter (Alexis Bledel) on “Gilmore Girls” (WB, 2000-07). Prior to that surprisingly popular series, Graham languished as a guest star on established series and as an occasional regular on shows that never made it out of their first season. But ever since “The Gilmore Girls,” she used this leverage to make the jump from virtual unknown to a