Rep. Michele Bachmann, stressing her Iowa roots and appealing directly to Tea Party voters, came out swinging Monday as she formally launched her campaign for president. Buoyed by a strong showing in several recent polls, the Minnesota congresswoman cast her campaign as the voice for "constitutional conservatives" looking for a government that lives within its means while giving the private sector the room to grow. She launched a broadside against President Obama for racking up too much debt while stimulating too little job growth and vowed to make him a "one-term president." "We cannot afford four more years of Barack...