The U.S. Supreme Court’s 9-0 decision Monday that former President Donald Trump will appear on Colorado’s ballot may well heighten Democrats’ possible backup plan: refusing to certify his Electoral College win should he win the Republican presidential nomination and then prevail in November’s general election. In a per curiam decision \– meaning all the justices agreed on the result — the court reversed the Colorado Supreme Court’s December ruling removing Trump, the GOP presidential frontrunner, from the ballot. The state court concluded in a 4-3 decision that the former president participa…