Howard has it here. See also this NYT editorial, this post at the WSJ law blog, and this BNA report ($). The BNA report quotes Bob Edgar of Common Cause as follows: “Bob Edgar, president of Common Cause, said the Fair Elections Now Act (HR 1826, S. 752) ‘sidesteps the Arizona problem by linking the payment of matching funds to each candidate’s in-state, small-donor fundraising, not opponent or independent fund-raising.’’ Edgar added, ‘The Fair Elections bill is carefully crafted to pass constitutional muster even in light of the Roberts Court’s U-turn toward campaign-finance deregulation.'”