The bills proposed by legislators are published in open data (thanks to years of advocacy by myself and others, but that's another story). If you want to read it and know who proposed it, this information has been readily available on the Internet since 1995. If you want to do some data mining, the data has been readily available to download in XML for about 5-10 years from Congress itself and for the decade before that from govtrack.us. If you're not doing the data mining already, that is about you and not about the availability of the data.