Unions continue spending lots of money to damage Romney in primaries

Obviously these campaign expenditures are made possible by the Citizen's United Case. Democrats have no problem using this ruling for their own benefit. I remember that AFSCME had spent $1 million just in Florida's Republican primary to attack Romney. From The Hill Newspaper:

Several unions that back President Obama’s reelection bid are spending big in an effort to damage Mitt Romney in key GOP primary states.

Unions including The American Federation of State, County and Municipal Employees (AFSCME) and Service Employees International Union (SEIU) are making ad buys to hit the Republican presidential contenders on issues key to their members, including immigration reform and the bailout of the auto industry.

The primary focus of the attacks, however, has been Romney, who appears likely to face off against Obama in the fall.
Larry Scanlon, AFSCME's political director, told The Hill that while Romney has yet to officially sow up the nomination, the general election season has begun.

"Our position is: We are in a general election now. We want voters to hear our message," Scanlon said. "We have endorsed Obama, and we're going to do what we can to get him reelected."

AFSCME, the country’s largest public sector union, spent $500,000 on Internet, television and radio ads to air in Ohio that target Romney before the state’s GOP presidential primary this coming Tuesday, according to Federal Election Commission (FEC) records. . . .

Scanlon said the large expenditures were not intended to influence GOP contests, but rather to define Romney for all voters. . . .