Rich people complain that they are losing influence in national politics

To be more precise, the merely rich are losing influence to the super-rich.The Washington Post focuses on the lost influence of the "bundlers":

Bundlers who used to carry platinum status have been downgraded, forced to temporarily watch the money race from the sidelines. They’ve been eclipsed by the uber-wealthy, who can dash off a seven-figure check to a super PAC without blinking...
But there is a palpable angst among mid-level fundraisers and donors that their rank has been permanently downgraded. One longtime bundler recently fielded a call from a dispirited executive on his yacht, who complained, “We just don’t count anymore.”

We should clarify that the "bundlers" are not necessarily millionaires, but that millionaires are encountering the same problem.
Their response - to focus more on buying Congressmen rather than a president:

Other bundlers, on the left and the right, are turning their attention to congressional races, where they can get more personal attention.
“Senate candidates will call asking for $2,700, and they are eager to talk,” said David Rosen, a longtime Democratic fundraiser. “When they come to town, they’ll meet with you one-on-one. But $2,700 won’t even get you a parking spot at a super PAC event.”