Rep. Jasmine Crockett (D-Texas) is expected to shake up the Senate race with a Monday announcement that she plans to run for the seat that Republican John Cornyn holds. If she officially files, Crockett will face off in the March 3 Democratic primary against state Rep. James Talarico. Meanwhile, Colin Allred, who ran against Sen. Ted Cruz two years ago and had hinted at another Senate run, is exiting the race to return to the House. Whoever emerges from the Democratic primary, and polls suggest Crockett is likely to do so, will face the winner of the GOP primary between...