DALLAS - Texas Republican Senate candidate Ken Paxton said that Dallas will host his party's midterm convention later this year. What we know: Paxton said Dallas will host the GOP midterm in September during a tele-town hall on Tuesday. Paxton said he anticipates Trump coming to the midterm to help him campaign in his Senate race with Democrat James Talarico. What we don't know: We don't know the dates that the midterm convention would be, or what venue would host it. The backstory: Sources confirmed in March that the Republican Party is exploring a national convention for the midterm elections,...