One month until Election Day, voter dissatisfaction with the economy, concerns about political extremism and frustration with President Trump have Democrats within reach of flipping four Republican-held governorships, opening a wide lead in Iowa and an expanding advantage in Ohio among likely voters, according to new polls by The New York Times and Siena University. In Texas, Gov. Greg Abbott, a Republican fixture in the state for decades, is now narrowly behind his Democratic challenger, Gina Hinojosa. The Democratic candidate also has an advantage in the race for governor of Alaska. The only place surveyed where the Republican is ahead...