Former President Donald Trump and Sen. JD Vance (R-Ohio) are scheduled to hold their first rally as the official GOP nominees for president and vice president, respectively, in Michigan on Saturday. The Mitten State’s top Democrat just posted a welcome video for the two Republicans ahead of their visit in which she offered four pieces of advice. In a video posted to X (formerly Twitter), Governor Gretchen Whitmer — who is currently serving her second term in office — said Trump and Vance “need to know” a few things about her state’s voters before speaking to them. “Welcome to Michigan, Donald …