Thanedar has spent millions the last months to promote his candidacy while Whitmer has hoarded her cash for later (Michigan primary is pretty late). It makes sense that he has taken a small lead.
I’m doubly surprised at how terrible a campaign Whitmer has run. She’s a totally uninspiring figure and public speaker from what I hear (this is completely anecdotal and may or may not reflect reality though - I’ve never personally heard her speak or campaign).
So in other words you are just blowing smoke.