Election data shows that three crucial battleground states have experienced a drop in Democratic voter registration since late 2020, ahead of a November rematch with former President Donald Trump and President Joe Biden. Nevada, North Carolina, and Pennsylvania — which saw some of the closest presidential elections last cycle — all currently have fewer registered Democratic voters overall than in late 2020, according to the most recent state records. While Democrats still lead Republicans in party registration, the margins in these states are much smaller than before. Read: Idaho Teen Arrested…