Not Withdrawing - Scaling Back
Campaign contributions have almost completely dried up. You simply can't run an active campaign without the funding, so he is scaling back. It sounded like the effort will be limited now to speaking engagements. He specifically mentioned rallies which are held. He'll certainly accept any invites for interviews with the news media.
I'd like to point out that Obama raised a record $55M in February, alone.
He also mentioned that he thought the March On Washington was still a good idea, but would have to be planned and organized by the grassroots. There are political and legal barriers to the campaign being involved. He said he would be there to speak, within the limits of what is allowed by law.
He said this campaign season was only the beginning of a long revolution. The grassroots would have to stay the course between now and the convention. Beyond November, the Revolution will have reenergize with Revolution candidates running for positions at all levels of government.
Frankly, the excitement of the early campaign back in November and December is gone. And with the excitement gone, the newbies drive for contributing vanished. It won't happen, but if the grassroots could be energized by that little rabbit guy and restart the contributions - like maybe $4 or $5M a month - Dr. Paul could renew a serious message blitz. If the economy continues to tank, this would be very strong and effective - the lone voice in the wilderness of Washington - warning of the looming meltdown. When the shit hits the fan, he would be standing there like a Jefferson or Madison, with the only plan to return the America economy to financial soundness. But there's not so much excitement in this and without the excitement there is no contributions that would allow it to happen.
So we're left with a Revolution where the cannons no longer boom, the volunteers have reached their 60 day enlistment and have gone home and the stalwart veterans are in planning sessions with eyes on the delegates and on the next two campaigns - the State Convention and the National Convention.