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Why is former congressman Bob Barr, the presidential candidate for the Libertarian Party, not invited to the debates?

The Commission on Presidential Debates, a nonprofit, nonpartisan organization responsible for coordinating the debates, has standards for deciding whom to invite. A candidate must average at least 15 percent in five national polls and have his or her name on enough state ballots to have a mathematical chance of securing 270 electoral votes. Besides Barr, the Constitution Party's Chuck Baldwin, the Green Party's Cynthia McKinney and independent Ralph Nader did not meet those standards.

Defining 'middle class'

We are hearing the term "middle class" a lot this election season. What is the accepted definition of the term, and is there an income range that represents "middle class"?

There's no standard definition for "middle class." It can mean different things depending on who is using the term; economists differ on what range of income defines the group. Only 1 percent of Americans told the Gallup Poll they were "upper class," and only 7 percent "lower class," leaving 92 percent saying they were "middle" or "upper-middle" class. The Census Bureau reported the median household income in the United States was $50,233 in 2007.

Harvard tuition $20 - in 1807

John Adams was the first president to graduate from Harvard. How much do you think the tuition was at that time?

The earliest dollar figure for Harvard tuition comes from 1807: $20. When John Adams graduated from Harvard with a bachelor of arts degree in 1755, the annual tuition was less than $20. Tuition rose to $55 in 1825. The current tuition at Harvard is $32,557, not including room, board and student services fee.

Read FDR's speech

Can you elaborate on FDR's 1932 speech at during the Great Depression?

New York Gov. Franklin Delano Roosevelt gave the commencement speech to Oglethorpe University graduates on May 22, 1932, in Atlanta. It was two months before Roosevelt's nomination as the Democratic presidential candidate. The speech contained references to the stock market as well as to the nation's overabundance of lawyers and schoolteachers. The following famous lines come from it: "The country needs and, unless I mistake its temper, the country demands bold, persistent experimentation. It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something. The millions who are in want will not stand idly by silently forever while the things to satisfy their needs are within easy reach."

The speech can be read at