PRINCETON, NJ -- Hillary Clinton is one of the best-known political personalities in the country, having been in an intense public spotlight for more than 15 years. Although Clinton has been well-known for some time, opinions of her have shifted considerably as the years have gone by. At one point in early 1999, toward the end of her husband's impeachment proceedings, Clinton was viewed favorably by 66% of the American people. But within two years, just after the Clintons left the White House in 2001, her favorable rating had fallen to 44%. More recently, Hillary Clinton's image has undergone a...