Texans have become accustomed to occupying the nosebleed seats at the Democratic National Convention, extras in a production that favors states that are solidly blue or liable to swing that way. But this year, even the most cynical Texas Democrats say they sense a tangible shift — a feeling that that they’re being positioned to be closer to the front row. 

There was the selection of San Antonio Mayor Julián Castro, an ambitious young Latino with deep Texas roots, to give the convention’s Tuesday night keynote speech.

There’s the palpable energy behind several up-and-coming Texas Democrats running ...

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