martha: fox news alert, we are seconds away from one of the biggest shockwaves to hit the g.o.p. presidential field, since the campaign started getting rolling here. minnesota congresswoman,elle ba announce, the republican nomination for president, and, she s set to comed to podium, any moment now, and, that is how we kick off a brand new hour of america s newsroom, i m martha maccallum. gregg: i m gregg jarrett in for bill hemmer and bachmann kicking off a tour, in the hawkeye state, emerging as a clear challenger to mitt romney. i was born in iowa and i have a distinct advantage there, i think, and, also, i think since the debate people have paid anything else and have