Paul Kiel at TPM Muckraker explains the what and how details.

Basically, Solomon cherry picks sentences in a statement by Reid, then by implication rearranges their meaning to manufacture false justification for his critical "journalistic" endeavor. Josh Marshall expresses his take on the situation, speculating Solomon is just making up crap, to throw at a top Democrat as a phony "balance" for press criticism of prominent Republicans.

Update:
John at AMERICAblog provides added analysis, and suggests if AP is going to lie and play partisan politics, its tax status needs to be altered.