In today's episode of US Election Watch, with the US presidential elections just around the corner, opinion polls show Republican candidate Donald Trump and Democratic candidate Kamala Harris in a tight race. Both campaigns are concentrating on key swing states, which have historically played a significant role in election outcomes. This year, Pennsylvania is the biggest swing state, with 19 electoral votes at stake. Recently, Trump held a rally there, while Harris addressed supporters in Nevada on the West Coast. NDTV's Allister D'Souza to Daniel Mallinson, Professor of Public Policy, Pennsylvania State University.