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DALLAS — Idealistic and motivated, the young organizers fanned out through a neighborhood of ranch houses on a scorching midsummer morning, eager to educate Texans on the benefits coming their way under President Obama’s health insurance law. They were armed with clipboards stacked with glossy ”Get Covered’’ brochures and a script on how best to approach their uninsured targets, whose addresses had been carefully mined from a national database. But a few hours spent with the team, from a nonprofit organization called Enroll America, illustrated the enormous challenges facing the White House and supporters of the health care overhaul in states like Texas, which is hostile country.