Two recent incidents involving US congressional candidates on opposite coasts have blown up into major controversies, underscoring how the Israel-Palestine conflict has transformed US elections – and illustrating how aggressive protest tactics can spark backlash that overshadows the issues activists meant to highlight.Scott Wiener, a gay Jewish state senator and trans rights advocate who is currently the frontrunner in the race to replace the longtime representative Nancy Pelosi in California’s 11th district, said he felt forced to leave last week’s annual trans pride march in San Francisco after a group of people ran up to him at a local park...