I wouldn't take too much from state elections where local issues predominate. These were not a plebiscite on Trump. Trump's real measure of success will be to move the political equilibrium towards a nationalist and populist centre.. for BOTH parties.. and away from the free market economic ideology and amoral humanist agendas that dominate the Establishments the Repubs and the Dems.
Trump will win a second term if he keeps his promises in dismantling global free trade, appointing moral candidates to the USSC, reestablishing respect for borders and laws, investing in infrastructure, providing sound economic management. What's more he'll likely develop alliances with populist politicians from both parties to implement that agenda.