Bernie Sanders in POWER I was a member of the Democratic Party, and became the Chairman of the Democratic Party near the end of POWER I. He assumed the role when elected by the members after Foreman Domai set party taxes to 100%. Bernie soon resigned, giving the seat to another member and supporting Sandy Weathers for the presidency of the United States. He soon disappeared completely after his resignation and was criticized for it by the Republican Party and some members of the Democratic Party.
Bernie Sanders in POWER II had returned quietly for some time, but under a different alias. He was known as "Phil Scott", which is the current governor of Vermont in real life. His political career in POWER II was short, as he joined the GOP. He soon disappeared again soon after.
Bernie Sanders soon rejoined the Democratic Party a year after his resignation and became the Senator of Vermont, alongside Huey Long and Sandy Weathers, who was the governor at the time. He frequently criticized the Green Party, and accused them of alting on multiple occasions after Vermont was bombarded with members of the Green Party. He rose to the first page of the National Politicians but soon fell. At the end of POWER IV, he was on page 2.
In POWER V, Bernie Sanders assumed chairmanship of Sinn Fein, but shortly resigned from the position due to the complicated UK politics, and because of his failure to get any sort of political recognition or seats. Yet, he was the 2nd most influential person in UK Politics at the time. His rival, Sean McCarthy was also a huge reason for his dash to America. He's moved to Vermont ever since.
Bernie Sanders started off his run in POWER VI as a part of the Democratic leadership, and immediately ran for governor. He was first opposed by John K. Smith of the Greens during the Gubernatorial race, but his opponent soon dropped out. Soon after, the VT Democrats and Greens soon engaged in a PSO war in which Bernie Sanders contributed a majority of his power. However, the war soon ended as the VT Dems and Greens signed the official Vermont agreement. Bernie then spent his time on other issues, aiding Charlie Chan in presidential elections and maintaining his seat.