Derek Tran maintained his lead over Rep. Michelle Steel in the highly competitive race for California’s 45th congressional district on Tuesday, still one of the closest House contests in the nation. Tran, a Democrat and Orange-based attorney, increased his advantage to 613 votes, adding another 32 votes to his lead from Monday’s tally.

In a major victory for Democrats, first-time candidate Derek Tran defeated Republican Rep. Michelle Steel in a hotly contested Orange County congressional race that became one of the most expensive in the country.

Democrats have taken control of California's 45th Congressional District from the GOP, with Republican Rep. Michelle Steel losing her Orange County House seat to Democrat Derek Tran, CBS News projects.