It's been a long night of working on SOTU-db so this will be brief:
SOTU-db is now in alpha release! Full-text searching is not yet enabled, but users can search for a limited set of SOTUs via text search or filter-list. Users can also select a "chunkSize" which determines how many words SOTU-db considers in each chunk of sentiment analysis. SOTU-db will (after a brief pause..) return the cleaned (lowercase, no punctutation) text of the selected SOTU along with a chart showing the relative sentiment (positive - negative) of each chunk of text within that SOTU, according to the three different sentiment lexicons available in the tidytext package for R.
SOTU-db is currently password protected. For access, just ask.