Democrats running for governor across the country are making tariffs a central element of their political message this year. They’re betting that in an election year dominated by issues ranging from immigration to the war in Iran, rising costs tied to tariffs will be a motivating factor for many voters. Republicans are entering a challenging election year. Much of the focus has been on Congress, where Democrats are just a few seats shy of taking the House majority. But the party is also aiming to regain ground outside Washington as they hope to hold onto competitive governorships in Arizona, Michigan and Wisconsin and flip GOP-held seats in states such as Nevada, Georgia and Iowa.