Ken Paxton, one of the party’s top Senate candidates and a Trump loyalist, said that “everybody’s numbers dropped” after the event, according to audio obtained by The Times. Ken Paxton, the Republican nominee for Senate in Texas, told a group of conservative donors and lobbyists last week that President Trump’s midterm convention in Dallas had hurt Mr. Paxton politically, according to an audio recording obtained by The New York Times. The recording, which is muffled at times, captures Mr. Paxton being asked, “Do you feel like he’s a little bit of a drag?” It is not clear from the audio...