As the Republican National Convention commences in Wisconsin, a look at polling from that key battleground state reveals the problems President Joe Biden faces as voters there consider his mental and physical fitness for office.

Though this polling was conducted before the horrible assassination attempt against former President Donald Trump, that tragedy will not likely have material fallout in assessing Biden’s cognitive state. This polling, however, was conducted in the wake of Biden’s live TV meltdown in the CNN debate. (RELATED: CHRISTIAN WHITON: Biden’s Press Conference Performance Bought Him Time — But Sealed His Fate All The Same)

In Wisconsin, the presidential race remains tight, to be sure. But since Biden’s clear stumbles before a 51 million viewer national audience, there has been a modest but discernible move toward Trump in the battleground states. For example, the American Greatness poll just conducted in Wisconsin moves from a tie to Trump 2%, in both a two-man race and in a multi-candidate field.

But the numbers beneath that topline snapshot are more compelling for Trump and against Biden, because they reveal an entirely new lane of political relevance: Biden’s incapacity.........

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