James Talarico is asking Texas to do something it hasn’t done in nearly 40 years: Elect a Democrat to the U.S. Senate. It won’t be easy. It will take a vast coalition of Democrats, independents and Republicans in a bright red state that President Trump won by about 14 percentage points in 2024 — and where Republicans have plowed hundreds of millions of dollars into beating Mr. Talarico. And yet, p…