All things being equal, the only reason Democrats might have to complain about the affect of FEC vs. Citizens United on paid political speech is if it somehow removed some pre-existing advantage they had. Why else cause such a fuss? The left clearly has just as much right to take advantage of the current state of political discourse as anyone, right?
So that’s not the problem, is it?
The real problem has nothing to do with money. Democrats have tons of that and always have. And they never complained when they could afford more “speech” than anyone else. So spending money on speech is not the issue.
And it has nothing to do with ‘transparency, not the way they have framed it. They want “transparency” because without it they can’t use their media advantage to intimidate opponents into keeping their opinions, ideas, and money to themsleves. Democrats can’t silence groups of donors they cannot specifically identify (see also Obama/FEC trying to force Right wing groups to release donor lists).
So Democrats are not worried about money in political speech. They are worried about money and speech they can’t control. They are worried about people hearing any message that is not their message.
Democrats are afraid of free speech because they simply do not think you are smart enough to know what you are supposed to believe.