HOUSTON --A spokesman for Lt. Gov. David Dewhurst says the state lawmaker will officially announce later this week his intention to run for U.S. Senate. The Houston Chronicle reported Monday that spokesman Mike Walz says Dewhurst will make his announcement by "midweek" via video to run for the seat held by Republican Kay Bailey Hutchison. Hutchison is not running for reelection in 2012. Dewhurst, who had been expected to run for the seat, would join a crowded Republican primary. Candidates include former Texas Solicitor General Ted Cruz, former Dallas Mayor Tom Leppert and former Texas Railroad Commissioner Elizabeth Ames Jones. Dewhurst, a Houston multimillionaire, has been lieutenant governor since 2003.