Cause why not?
Check her out:

Now that Hillary is officially in the running, prepare to start hearing the s-word. Don’t like her politics? Sexist! Disagree with her positions? Sexist! Still have issues with Benghazi? Sexist!

The s-bomb will be dropping left and right over the next 18 months during an election season that’s bound to witness a violent collision of culture and politics. Obama’s exit will end the age of racial politics just in time for Hillary to usher in the era of gender politics.