The Democratic Governors Association has spent or plans to spend nearly $1.2 million on ads that paint GOP candidate Dan Cox as overly conservative, according to data from ad tracking firm AdImpact. Political analysts say the ads are likely to help Mr. Cox, who was endorsed by former President Donald Trump, win the GOP nomination, but he would struggle to win the general election in a state where President Biden defeated Mr. Trump with a percentage of 65%. to 32%.