Both major parties get financing at about the same level of magnitude, often from similar sources. A good example would be Microsoft Corporation - currently the largest corporation in the world. Microsoft has been under investigation and in litigation for anti-trust violations. The facts are clear, both parties act in similar ways when it comes to campaign financing. Since both parties also write the laws, there is little incentive to change.
Issue ads are another loophole in campaign finance reform.
Issue ads can be funded by soft money from a national political party or directly by special interest groups. Previous campaign finance reform bills suggested that the current regulations on PACs could apply if the ads met certain time criterion before the election or mentioned a candidate by name or likeness. Advocacy ads are unregulated. I do not believe there is a way that issue ads can be regulated, other than making sure that they do not contain explicit information about a specific candidate. I think the indirect actions of encouraging more non-traditional campaigns and educating the electorate on the dangers of single issue campaigns will do more to moderate the effects of issue ads than regulation.