President Obama’s proposed “Buffett Rule”-- which would force the wealthiest Americans to pay higher taxes to help cut the nation’s deficits -- has met its Republican match. Republican lawmakers have introduced their own “Buffett Rule” that would allow billionaire investors like Warren Buffett who say they’re not paying enough taxes to voluntarily give more money to the federal government. Under the legislation, authored by Sen. John Thune of South Dakota and Rep. John Scalise of Louisiana, taxpayers can donate at least a $1 to the Treasury fund for deficit reduction when they file their federal income tax returns starting next...