Texas has gained more than 2.5 million new residents since 2020 — roughly the entire population of New Mexico — reshaping the electorate and injecting new uncertainty into this year's marquee Senate race. Why it matters: Republican Ken Paxton is favored to defeat Democrat James Talarico in November, but the influx of new arrivals — along with fading Latino support for President Trump and booming exurban counties — has scrambled the political mat…