The American Presidency Project (U.C. Santa Barbara)
Online resource that consolidates the following information in a single searchable database:
• The Messages and Papers of the Presidents (Washington - Taft (1789-1913)); Public Papers of the Presidents (Hoover to Obama (1929-2011); The Weekly Compilation of Presidential Documents (Carter - G.W. Bush (1977-2009)); The Daily Compilation of Presidential Documents (Obama - Trump (2009-2017).
Contains thousands of political documents such as party platforms, candidates' remarks, statements of administration policy, press releases, and election debates.