PHILADELPHIA — President Joe Biden will visit Allentown Friday, the White House confirmed, his second visit to the state in about a week as he looks ahead to the 2024 election. Last Friday he visited Valley Forge and then made a campaign speech in Blue Bell, where he argued former President Donald Trump is a threat to democracy. It’s the second stop Biden’s made in the state just this year and at least the 16th since becoming president. Biden’s Allentown visit will be an official visit, aimed at touting his legislative record in a key part of swing state Pennsylvania. The Lehigh Valley region …