The Republican field in California’s competitive 7th District is poised to grow after Labor Day, with two prospective candidates planning to make announcements about the race. Former Rep. Doug Ose, a Republican who represented a large portion of the redrawn 7th District from 1999 until 2005, is expected to make an announcement on his plans for the race after Labor Day, according to a source close to Ose’s campaign. The source would not confirm whether Ose plans to run, but other operatives in the Golden State say Ose is likely to enter the race. Another Republican, Igor Birman, who currently...