Contrary to what many political pundits, including this one, thought would happen as soon as Donald Trump became the presumptive GOP nominee, the former president has maintained a slim but steady polling lead over President Joe Biden. As of today, the RCP Average has Trump with a 1.1% overall advantage, with Quinnipiac being the only May poll showing Biden leading, albeit by a mere 1%. By contrast, Biden enjoyed a 5.6% advantage this time in 2020, an election in which Trump never actually took the average polling lead.Still, are there signs that Trump's lead might be softer than we think?...