The provided sources consistently and authoritatively confirm the core elements of the statement. Multiple sources, including direct links to Polymarket, verify the existence of a prediction market titled 'Supreme Court rules in favor of Trump's tariffs?'.All relevant sources indicate that the market predicted a loss for Trump with a probability greater than 50%. While the exact percentage fluctuates, which is characteristic of a live prediction market, the reported figures provide a clear range. The evidence shows probabilities of Trump losing at 53%, 70%, 73%, and 77% at different points in time. The statement's specific claim of a 61% probability is not explicitly mentioned in any of the provided snippets. However, this figure falls squarely within the documented range of 53% to 77%. Given that market odds change continuously, it is highly plausible that the probability was 61% at the time the statement was made. Therefore, the statement is a credible representation of the market's sentiment, and the specific number is well within the bounds established by the high-quality evidence.