With so much at stake, we can’t allow for two sets of rules in this election whereby the Republican nominee is the beneficiary of unlimited spending and Democrats unilaterally disarm.
Therefore, the campaign has decided to do what we can, consistent with the law, to support Priorities USA in its effort to counter the weight of the GOP Super PAC. We will do so only in the knowledge and with the expectation that all of its donations will be fully disclosed as required by law to the Federal Election Commission.
Source: barackobama.com