Unless you are deeply immersed in politics, you likely missed a major development over the last three weeks: Since his State of the Union speech, President Joe Biden has seen a marked reversal of his fortunes. Indeed, since Biden addressed the nation in early March, polling shows that Biden is gaining ground, as former President Donald Trump now leads Biden by only one percentage point according to the RealClearPolitics polling average — Trump’s smallest lead since January. In the Quinnipiac poll released last week, Biden led by three points, 48 percent to 45 percent, bringing the total to 12 national...