Arizona congressional candidate's 3 young children gave almost $10K to his campaign

Conor O'Callaghan is running in the Democratic primary in Arizona 's 1st Congressional District .

Each of O’Callaghan’s three elementary-school-aged children donated the legal maximum of $ 3,300 to their father's U.S. House campaign.

The donations were dated Dec. 27 , four days before candidates are required to close their books for the year .