Editor’s Note: This is the first in a three-part series focusing on misstatements, prevarications and falsehoods proclaimed by the three major presidential candidates.Sen. Hillary Clinton presents the image of a seasoned, ever-disciplined politician whose experience as first lady and a New York senator makes her ready to be commander-in-chief. But a series of misstatements — exaggerations, half-truths and lies — made by Clinton over the last 15 years have at times undermined her image and called her credibility into question.