I don't find either Clinton or Trump to ever have been of "working class " understandings based on either of their life experiences. However, the record will show  Clinton - regardless of your personal likes or dislikes for her -has long been an advocate for "some" policies that would support the traditional and the new  members of the "working class". 
 I'm not certain how many merit badges she would deserve if she were in the Girl Scouts, but I am pretty sure that Trump would not only fail to earn merit badges, but would nevet be allowed to join the scouts, or would be expelled  by any civilized scout leader.   
Actual  public policy participation and performance - and results -should count for something. Clinton has been effective  in these arenas, according to all colleagues - whether Republican or Democratic- over her  decades in public life. 
 She has made mistakes certainly, and has supported the 1% far too often over the traditional Democratic base. But Trump? Seriously?