Rep. Darrell Issa (R-Calif.) is expected to drop his bid for reelection just ahead of California's congressional filing deadline on Friday, two sources familiar with the matter told Axios.Why it matters: The development shakes up the race for his seat significantly, with another Republican ally of Issa's reportedly filing to run instead.Issa's website was recently changed to display his PAC's logo rather than that of his campaign, Punchbowl News reported.Issa has maintained publicly that he is r...