PHOENIX — Protesters blocked a main highway leading into the Phoenix suburb where Republican presidential front-runner Donald Trump staged a campaign rally Saturday alongside Arizona’s contentious sheriff, Joe Arpaio. Tempers flared at the rally itself, but without the violence that marred Trump’s event in Chicago a week earlier and with none of the candidate’s usual goading of protesters from the stage. For hours, about two dozen protesters parked their cars in the middle of the main road to the event, unfurling banners reading “Dump Trump” and “Must Stop Trump,” and chanting “Trump is hate.” Traffic was backed up for miles, with drivers honking in fury. The road was eventually cleared and protesters marched down the highway to the rally site, weaving between Trump supporters who booed and jeered them. Trump supporter Geroy Morgan, 62, made it to the rally but was furious at the demonstrators, some of whom still stood around after the event ended. “We come here, the silent majority, to express our opinions,” Morgan said.