"Turns out, we weren't bullish enough on copper," Jefferies analyst Christopher LaFemina wrote in a note to clients, marking a notable shift from one of Wall Street's most seasoned metal voices. LaFemina joined Jefferies in 2011 after more than a decade covering metals and mining at Lehman Brothers and Barclays, lending weight to his view that the explosive growth in AI data center buildouts, power grid and infrastructure upgrades (a theme he calls "powering up America"), and tight supply are