Former Republican presidential candidate “Ron Paul’s son has officially entered the GOP Senate primary in Kentucky,” the AP reports.

Rand Paul’s campaign manager turned in the candidacy papers and a $500 check to the secretary of state’s office on Wednesday afternoon.

Rand Paul, a Kentucky eye surgeon, has raised more than $1.7 million for his campaign largely by reaching out to people who had supported his father’s unsuccessful presidential bid.

He’s running for the seat being vacated by fellow Republican Jim Bunning.