After a long fall, the Washington Nationals might be headed back up.(Tony Avelar/AP) A baseball fan doesn't need a lot of hope to inflate a hot-air balloon of optimism.But you need some.For the Washington Nationals and their followers, the first precious gulps of happy helium have arrived.Five weeks of solid 15-15 play have given the Nats buoyancy after three years of relentless post-championship dross.
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