1) Scrape a news source and check how many times the bill is mentioned? 2) How many results on a search engine for the bill's title? 3) Train something similar

1) Scrape a news source and check how many times the bill is mentioned? 2) How many results on a search engine for the bill's title? 3) Train something similar to sentiment analysis model based on the text content of the bill. You'd need historical data for that but see options 1 and 2.