Yes, indeed. The left has fought those "attacks" as they accept oodles of money from those evil corporations and from union groups. How much money again did the Unions in Oregon put into the measure 66/67 tax increase campaign last year?
Oregon Tax Hike Vote, Ballot Measures 66 and 67 (January 2010) - Ballotpedia
OEA, SEIU, AFT etc.. 1.65 million donated by the OEA.
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There is a list of some of the money for the other side of this issue.
Unlike the list you referenced almost all of this funding was corporate or corporate sponsered.
Unions in the US are tiny and stand no chance vs. the sort of coprorate money that now is free to flow.
2010 was just the beginning for People's United!
Not only does this allow corps to spend, and even produce material, to influence elections it protects them from declaring what they spent and where.
I did say that the left resists these forces more then the right, but pretty much both political parties have rolled over on their backs in an act of submission that would make my dog blush.
But no problem, the right will use their goof media and get the plebs all riled up about the unions.
"You can always hire one half of the poor to kill the other half" - From 'Gangs of NY'