Chris McGowan is set to succeed Rep. Randy Feenstra (R) in representing Iowa’s 4th Congressional District, Decision Desk HQ (DDHQ) has projected. McGowan led Democratic opponent Dave Dawson by almost 26 percentage points — 62.9 to 37.1 percent — with 68 percent of the vote reported by DDHQ as of 11:22 p.m. EST on Tuesday.…