WaPo has more here.
"Maryland Gov. Martin O'Malley (D) for the first time on Tuesday backed legislation to close a campaign finance loophole that boosted fundraising totals for his campaigns during more than two decades of successful elections in the state.
O'Malley, who is term-limited out, said he supports efforts to prohibit the so-called "LLC loophole." The practice lets individuals and businesses contribute in excess of state limits by donating through multiple business interests, most often limited-liability corporations."