SAN ANTONIO -

He's been on the national stage amid the pomp and circumstance of the presidential campaign, but when San Antonio Mayor Julian Castro announced his plans to run for a third term, the only bright light on him came from the sunshine.

In a nearly one minute-long video posted to his YouTube and Facebook pages, Castro stood in front of San Antonio's City Hall to talk about the bid.

"Every single day that I've been mayor, I've enjoyed coming to work to pursue a vision of becoming a brain-powered community that is the liveliest city in the United States - one that is economically prosperous with well-educated folks throughout our city," Castro said.

Castro's campaign kickoff is Saturday, Feb. 3, at 10 a.m. It will be held at 203 E. Jones Ave.

The City of San Antonio changed its term limits back in 2008, limiting candidates to four full terms in office. Before that, candidates could serve no more than two full terms.

Candidates can't officially file to run for city offices until Jan. 30.