CARACAS, Venezuela (AP) — Former U.S. President Jimmy Carter is expressing concern about Venezuela's escalating political crisis and wants to meet with leaders on both sides in an upcoming trip. Carter, a mediator of past political conflict in the deeply polarized South American nation, made the offer in private letters he sent this week to President Nicolas Maduro and opposition leader Henrique Capriles. Expressing "grave concern" about the loss of life in recent protests and the risk of more conflict ahead, Carter in the letter to Capriles said that for dialogue aimed at easing tensions to succeed both side must...