These numbers show a slight shift from results with leaners found two weeks ago, when Boxer led Fiorina 49% to 44%. Leaners are those who initially indicate no preference for either of the candidates but answer a follow-up question and say they are leaning towards a particular candidate. From this point forward, Rasmussen Reports considers results with leaners the primary indicator of the race…

Since February, Boxer’s support has ranged from 42% to 49%. In those same surveys, Fiorina, former CEO of Hewlett-Packard, has earned 38% to 43% of the vote.

Seventy-four percent (74%) of Fiorina voters are already certain of how they will vote this November, as are 69% of those who support Boxer, a member of the Senate since 1993.