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The attacks mirror the Democrats' strategy of taking on the Koch brothers.
Self-funded candidate handily defeats two others backed by super PACs and will be heavy favorite in June special election.
In crowded primary fields, Republicans are getting creative to stand out.
Michigan Republican Senate candidate Terri Lynn Land ridicules the attacks in her first TV ad.
She criticizes a provision of Obamacare in her latest ad.
The former presidential candidate is appearing in ads, writing endorsement letters, and giving money in a few select races.
New ad mimics tactics that Democrats used to boost Todd Akin in 2012 Senate primary.