After Attorney General Ken Paxton (R) defeated Sen. John Cornyn (R-Texas) in the Republican primary for U.S. Senate last month, it wasn’t surprising that Republicans launched a barrage of attacks against Democratic nominee James Talarico. What was surprising, though, and troubling, is that they attacked not Talarico’s record or past rhetoric, but his masculinity. Paxton got things rolling on election night, calling him “Tofu Talarico,” “James Tala-freako,” and “low-T Talarico.” Trump aide Stephen Miller piled on, suggesting that Talarico was transgender. Others insinuated that he was secretly gay and that his girlfriend was fictional. (This is a bold strategy, because...