The FOX show on Wednesday night checked in at official viewing parties located at the finalists' hometowns. Castro attended the Fifth Harmony party, located at Oak Hills Church where Hernandez sang in the choir, and appeared on TV cheering on the group.
Hernandez tweeted her thanks to Castro.
Thank you so much to Mayor @juliancastro for attending the voting party and for supporting the girls and I!! What an honor! God bless you— AllyBrooke Hernandez (@AllyBrooke) December 20, 2012
Castro was the keynote speaker at this year's Democratic National Convention. His speech drew comparisons to then-Sen. Barack Obama's (D-Ill.) 2004 convention keynote speech.
Lis Smith, director of rapid response for Obama's 2012 campaign, tweeted that the "sky's the limit" for Castro after an appearance on "X-Factor."