PRESIDENT Ferdinand Marcos Jr. undertook the impeachment of Vice President Sara Duterte to block the shoo-in for the presidency in 2028, so he could get somebody to his liking. If that was the strategy, the latest evidence suggests it has backfired — not because Sara has been untouched by controversy, but because the proceedings have transformed her from an embattled vice president into the country’s most visible opposition figure. The persecuti…