A no-lose set of conditions is one in which there will be a happy and successful result whatever happens.

For him this is a no-lose campaign - he will become either vice president-elect or a much stronger presidential contender for the next election. 不论结果如何，他都是这次竞选的赢家——要么当选副总统，要么将成为下届总统选举中更强劲的竞争者。