C-SPAN Classroom provides free resources for teaching civics and U.S. government classes.
The United States Senate's website contains information on the legislative proceedings and history of the United States Senate.
The American Political Science Association is the leading professional organization for the study of political science.
The Senate Republican homepage contains broad overviews of the policy and issue positions of the Republican party in the U.S. Senate, blogs, statements and more.
The Dirksen Congressional Center is a non-partisan, non-profit organization that seeks to promote civic engagement by promoting a better understanding of Congress and its leaders through archival, research, and educational programs.
Wikipedia's entry on the history of the United States Senate.
The United States Senate Youth Program is an excellent opportunity for high school juniors and seniors to deepen their knowledge of the Senate and the federal government overall, as well as receive a one-time $5,000 college scholarship to the undergraduate college of their choice. Begun in 1962 through Senate Resolution, the program is sponsored by the Senate each year to encourage high school students to pursue careers in public service.
The American Political Science Association, the leading professional organization for the study of political science, provides resources for teaching the Constitution.
The Daily Digest is an up-to-date digest of the previous day's business in both the U.S. Senate and the U.S. House of Representatives.
In the spirit of Thomas Jefferson, legislative information from the Library of Congress. The Thomas system contains the text of bills, amendments, laws and more. THOMAS was launched in January of 1995, at the inception of the 104th Congress. The leadership of the 104th Congress directed the Library of Congress to make federal legislative information freely available to the public. Since that time THOMAS has expanded the scope of its offerings to include the features and content listed below.
The U.S. Government Printing Office disseminates official information from all three branches of the Federal Government. They maintain the official website for the Senate's Legislative Calendar.
The Senate Republican Conference is the formal organization of Republican Senators. Over the last century, the mission of the Conference has expanded and been shaped as a means of informing the media of the opinions and activities of Senate Republicans. Today the Senate Republican Conference assists Republican Senators by providing a full range of communications services including Graphics, Radio, Television, and Internet.
The Inter-University Consortium for Political and Social Research (ICPSR) maintains and provides access to a vast archive of social science data for research and instruction.
The Senate's Floor Calendar from republican.senate.gov
A flow chart detailing the hierarchy of leadership in the United States Senate.