Republican strategists and insiders have insisted that former President Donald Trump, his campaign and his surrogates have to hammer Vice President Kamala Harris on the economy. But a GOP pollster now says Harris’ team has managed to neutralize the attack — and called the issue “no longer this unique Trump strength.” Trump has attacked Harris and blamed her for causing runaway inflation, but Harris hit back in an interview with MSNBC this week, attacking her Republican rival as unserious on economic policies as she vowed to attract new investments in manufacturing. She has billed her vision as…