President Obama’s controversial decision last week to suspend new anti-smog standards offered hints — but not the full road map — of how the White House will navigate politically explosive battles with congressional Republicans over which industry regulations to sacrifice and which ones to fight for this fall. The Friday decision, which angered many environmental activists and won praise from business groups, represented the most high-profile case in a debate that carries deep implications for Obama’s reelection campaign as he tries to spur job creation, woo business donors and fire up his voting base.