Watch Katy Perry perform on the campaign trail for her pal, 'Hilly C'

Should there be a Hillary Clinton presidential library one day, an entire wing devoted to Katy Perry's show-stopping looks from the campaign trail may be in order. 
The pop star, who has made it abundantly clear that she's #WithHer, headlined a concert supporting the Democratic presidential candidate in battleground state Pennsylvania on Saturday night.
"I admire so many things about Hilly C," Perry told the crowd who, in turn, roared. 
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