Like so much that Obama says, this is absurd. Obama knows that he is raising far more money than the Republicans, so how are the Republicans "gaming the system"? Here, apparently, is the explanation:
Obama said McCain and the Republican National Committee are fueled by contributions from Washington lobbyists and political action committees.
"And we've already seen that he's not going to stop the smears and attacks from his allies running so-called 527 groups, who will spend millions and millions of dollars in unlimited donations," Obama said.
This was too much even for the Associated Press, which commented:
Despite that claim, few Republican-leaning groups have weighed into the presidential contest so far. In fact, Obama allies such as MoveOn.org are the ones that have been spending money on advertising against McCain.In past elections, spending by Democratic-allied 527s like MoveOn and ACT has dwarfed spending by Republican-allied groups. Thus, Obama is just making it up, trying to deceive his own followers, most of whom, as he knows, are not well-informed.