a primary challenge today. after 17 terms in congress, some say he is too old, and served for too long, and hall hit back saying, i m the hardest working in politics that you ever saw and i still run two miles every time and i vote 99% of the time and i do everything that those other guys do, and john rathman says it is a change and the founding father never intended for someone to serve for so long. all right. for all of you science geeks, you can geek out in the next hour, because the president is going to host the annual white house science fair which makes for great pictures. remember this shot of the president with the marshmallow cannon? what will happen this year? it focuses on the girls and women underrepresented in the fields of science, technology, and math. no surprises here, kelly ayotte will endorse republican scott brown for senate in new hampshire. he is taking on incumbent jeanne