News Trump admin-backed series will still feature Vanilla Ice and Milli Vanilli Bret Michaels of Poison performs in 2022 (photo: Kevin Mazur / Getty Images for Live Nation). Freedom 250’s Great American State Fair lineup is shrinking faster than a campaign promise after Election Day. Two days after SPIN highlighted the deeply bewildering artist roster attached to the National Mall celebration — a lineup that somehow managed to unite Vanilla Ice, C+C Music Factory, Flo Rida, Martina McBride and Milli Vanilli under one aggressively Stars and Stripes banner — the event is now facing a growing wave of artist withdrawals. Poison frontman Bret Michaels has officially exited the concert series, joining several other acts distancing themselves from the event amid mounting scrutiny over its political associations.…