Mentioned

Ron Johnson makes the list of "Tea Party candidates" who are shaking up races and threatening incumbents:

Republican Ron Johnson, the owner of a Wisconsin-based company that makes plastic packaging materials, has called for reducing the size of the government, opposes amnesty for illegal immigrants and cap-and-trade legislation, and advocates repealing the health care overhaul law. He's also said man-made global warming hasn't been proved and he questioned how Social Security is different from a Ponzi scheme.

Johnson is willing to spend as much as $15 million of his money to unseat three-term Democratic Sen. Russ Feingold.