Swing State Project

A 30-year-old San Antonio city councilman says his lead in the mayoral election should erase doubts that he's too young to lead the nation's eighth-largest city, but his 70-year-old opponent isn't so sure.

Councilman Julian Castro will face retired Texas appeals court judge Phil Hardberger in a June runoff for mayor because neither received more than 50 percent of the vote on Saturday.

Castro led with about 42 percent, or 47,893 votes, after three-fourths of precincts were counted. Hardberger received 30 percent of the vote, or 34,280 votes.

"The lion's share of voters in San Antonio believe I can effectively lead," said Castro, who was the subject of jokes during his campaign because of his age and youthful appearance.

Castro faced a double-scandal (literally) when he was busted extending his campaign schedule in an innovative way:

The election gained attention last month when Castro's twin brother, Joaquin Castro, stood in for him on a city council parade float. Hardberger accused the brothers of trying to deceive the public.

The brothers responded by joking about the so-called "Twingate" affair, with Julian wearing an "I'm Julian" T-shirt and his brother wearing one that said "I'm Not Julian."