The Daily Caller has a story about Republican candidates secretly paying bloggers to promote them.

But increasingly, many bloggers are also secretly feeding on cash from political campaigns, in a form of partisan payola that erases the line between journalism and paid endorsement.

“It’s standard operating procedure” to pay bloggers for favorable coverage, says one Republican campaign operative. A GOP blogger-for-hire estimates that “at least half the bloggers that are out there” on the Republican side “are getting remuneration in some way beyond ad sales.”

Some examples:

In California, where former eBay executive Meg Whitman beat businessman Steve Poizner in a bitterly fought primary battle in the campaign for governor, it sometimes seemed as if there was a bidding war for bloggers.

One pro-Poizner blogger, Aaron Park, was discovered to be a paid consultant to the Poizner campaign while writing for Red County, a conservative blog about California politics. Red County founder Chip Hanlon threw Park off the site upon discovering his affiliation, which had not been disclosed.

Poizner’s campaign was shocked to learn of the arrangement, apparently coordinated by an off-the-reservation consultant. For Park, though, it was business as usual. In November 2009, for instance, he approached the campaign of another California office-seeker — Chuck DeVore, who was then running for Senate — with an offer to blog for money.

“I can be retained at a quite reasonable rate or for ‘projects,’” Park wrote in an e-mail to campaign officials. In an interview, Park defended himself by claiming, “nobody has any doubt which candidates I’m supporting,” and noting that his blog specifies which candidates he “endorses.”

But while Red County’s Hanlon expressed outrage at Park’s pay-for-blogging scheme, questions arose about his own editorial independence when it emerged that Red County itself had been taking money from the Whitman campaign.

I’m sure this goes on to some extent on the other side as well. The blame lies with the bloggers themselves, who at least have an ethical obligation to make such financial relationships public.