How can you tell? Check this AP article out:
WASHINGTON - Acting swiftly as his party's presumed presidential nominee, Barack Obama is keeping Howard Dean at the helm of the Democratic National Committee, while bringing in one of his top strategists to oversee the party's operations.
The campaign also announced that the DNC will no longer accept donations from lobbyists and political action committees, to comply with Obama's campaign policy. Party officials say they expect the DNC's staff to quickly expand to run an aggressive general election campaign.
The DNC will no longer accept donations from lobbyists and PACs. Pure awesomeness. How are they going to raise the money to run the campaign? We the voters are going to chip in and pay for it, $5, $10, $20 at a time.
Here the entire article. As the article states, Obama's campaign is not entirely lobbyist influence free, but this is a huge step in the right direction.