Republican voters in Maryland on Tuesday made their state the latest to elevate a nominee for governor who denies the 2020 election’s legitimacy, choosing Dan Cox, a first-term state legislator who wrote on social media during the Capitol riot that Vice President Mike Pence was “a traitor.”
Mr. Cox handily defeated Kelly Schulz, a political protégé of Gov. Larry Hogan, a leader of the party’s anti-Trump wing, in a contest defined by…