President Barack Obama, criticized by campaign finance reform advocates for not living up to his repeated pledges to reduce the role of special interests in elections, plans an aggressive push-back to last week’s Supreme Court decision overturning restrictions on political spending by corporations, unions and other organizations. POLITICO has learned that the White House is in talks with congressional offices about efforts to require shareholders to vote before a corporation could spend money in elections, require companies that pay for ads supporting or opposing candidates to more clearly identify themselves in the ads, restrict the ability of companies with big...